Ashburn Allergy PLLC

A medical clinic located in Ashburn, VA that specializes in allergic disorders. Dr. Jiun Yoon is a board-certified adult and pediatric allergist.


Happy Nurses Week to our three favorite nurses! Elizabeth, Yenny, and Kim are energetic, intelligent, and always greet you with a smile! Ashburn Allergy appreciates the great care you provide for our patients!!

Gesundheit! Bless you! You may have been hearing those words more frequently lately! We are in the midst of the Spring Tree Pollen Season. Below is a graph courtesy of Susan Kosisky of USACAEL that shows the tree pollen counts (colored lines) over the last couple of years against the background (bars) of the average tree pollen counts over the last 3 years. Traditionally, the peak has been the 3rd or 4th week of April. This year, we are predicting the peak to be the 4th week of April or the 1st week of May. Get those tissues ready.

Medications such as antihistamines (Allegra, Claritin, Zyrtec) can help with the itchy symptoms and nasal sprays (Flonase, Nasacort, Rhinocort) can help with the sinus pressure and runny, congested nose. For a lot of people, those medications are not enough or they are seeking a more long-term solution. Aeroallergen immunotherapy injections "Allergy Shots" can be that solution.

Call now to schedule your appointment to discuss your case and together we can develop a personalized treatment plan to help you feel better and allow you to enjoy the great outdoors again. . (571) 246-6323

[04/09/19]   One year ago today, we officially opened Ashburn Allergy! We would like to thank all of our wonderful patients!

Allergic Living

This can be a game changer for our long suffering teenage eczema patients.

The FDA has just approved the biologic drug dupilumab for teens aged 12 to 17 with moderate-to-severe eczema. Read about the profound impact it has had on young Benjamin's life. #eczema #dupilumab

Ashburn Allergy, PLLC — Nextdoor

We're on @Nextdoor! Recommend Ashburn Allergy, PLLC and help us spread the word! Ashburn Allergy, PLLC is on Nextdoor, the private social network for neighborhoods.

[03/01/19]   ****Update (@10PM 2/28/2019)****
Clinic hours for Fri, Mar 1st. We are planning to open as usual at 7:30AM. We will continue to monitor conditions and will post any additional updates.

[02/28/19]   Looks like March is roaring in like a lion. We are monitoring the weather reports for Fri, March 1st. A decision to close or open late will be made later tonight and will be updated on the website and on this page.

[02/19/19]   ***UPDATE*** Due to the Wintery precipitation expected, the clinic will be CLOSED on Wed., Feb. 20th

[02/19/19]   We are monitoring the weather. There is a good chance that the clinic will be closed Wed., Feb. 20th due to the Wintery weather conditions expected. We will make a decision by Tues. afternoon and will keep everyone updated.

[02/04/19]   Just a friendly reminder that the clinic will be closed this Thursday (Feb. 7th) and Friday (Feb. 8th).

Food Allergy Research & Education

Not all testing is equal. IgG testing for food sensitivity advertised and marketed on the internet is unproven and could lead to unnecessary elimination of food and nutrients.
A board-certified allergist is uniquely trained to help patients determine if their symptoms are due to a food allergy vs food intolerance or sensitivity.

Do not diagnose a food allergy on your own. Suspected food allergies should always be evaluated, diagnosed, and treated by a qualified medical professional, such as a board-certified allergist. Learn more about food allergy diagnosis and treatments here:

[01/14/19]   Due to icy conditions predicted in the morning, we will open the clinic at 9AM on Tuesday, January 15th!

[12/29/18]   Happy New Year! The clinic will have modified hours on Mon. Dec. 31st. We will open at 10AM as usual but will close early at 4PM with the last shots given at 3:30PM. We will also be CLOSED all day on Tues. Jan. 1st, 2019!!

Merry Christmas and Happy Holidays from all of us at Ashburn Allergy!!!

[11/21/18]   Happy Thanksgiving from all of us here at Ashburn Allergy!!

[11/17/18]   The clinic will be CLOSED Thurs., Nov. 22nd and Fri., Nov. 23rd.

[11/15/18]   Weather Update:

The clinic will open at 9AM on Friday, Nov. 16th due to the icy conditions expected overnight and in the AM.

Allergy Doctor Serving Ashburn

Food Allergies
There is no doubt that the diagnosis of food allergies is increasing among our children. Along with that diagnosis comes a lot of fear, anxiety, and uncertainty. There are many theories as to why there has been an increase in the diagnosis of food allergy.
One reason is that doctors are looking for it more and ordering more blood tests for food allergies. The problem lies in that a POSITIVE test DOES NOT necessarily mean that the patient has a food allergy and is at risk for a life-threatening allergic reaction. Patients and especially children who have a history of atopic dermatitis/eczema often have false positives or sensitization without clinical relevance. There are many patients that although the blood testing shows positive can tolerate the food without any signs or symptoms of a life-threatening allergic reaction.
In any field of medicine, the doctors are taught to use labs and tests in the context of the patient's history to help guide them to the correct diagnosis. No test/lab is 100% accurate. This is especially true in the diagnosis of food allergies as the accuracy of the food allergy test is around 50% for a positive result.
Randomly ordered blood testing for foods can actually lead to a misdiagnosis of food allergies. A diagnosis of food allergy often leads to life-changing adjustments for not only the patient with the diagnosis but also for those that interact with them on a daily basis.
Allergists undergo advanced training and are board-certified to be able to evaluate the allergic patient and to use/interpret the skin testing and/or blood testing based on that clinical history to determine whether the patient truly has a life-threatening food allergy. Often times the recommendation is not to do any blood or skin testing; if the clinical history is not consistent with a likely food allergy. Allergists can also offer oral food challenges if clinically indicated to rule in or rule out a food allergy if the testing and history are not consistent with the diagnosis. If the patient does have a food allergy, the allergist can work with them to develop a food allergy action plan.


Finally, the sun is visible again!!

The rains have stopped for now and the forecast for the next week or so is for many sunny days. The sunshine combined with the previous weeks of rain is a perfect setup for our weeds and molds to become very active and release pollen and spores into the air. Those with Fall allergies are likely to be affected. Historically, the peak for weeds is 2nd week of September. Make sure to take your long-acting antihistamines for the itchy symptoms and the steroid-based nasal sprays for the stuffy nose symptoms. We can help to pinpoint which environmental trigger is causing symptoms and also help to fine-tune your medications and/or offer other options that may allow you to be medication free. Call (571) 246-6323 to set up your appointment.

Below graphs courtesy of Sue Kosisky and Mariko Marks at USACAEL

FDA Extends EpiPen Expiration to Tackle Shortage

The FDA has extended the expiration dates of certain lots of Epipen and it’s generic unbranded pens due to the shortage of Epipens.

However, there are other alternative brands of epinephrine pens available that are in abundant supply. Auvi-q and the generic for Adrenaclick are ready available and the Auvi-q pens can be obtained with $0 copay for most insurances. (571) 246-6323 EpiPens are still available in the U.S., but are in limited supply in certain areas due to factors such as supply disruptions and manufacturer issues, according to the FDA.

FDA approves the first generic version of the EpiPen

Another option hopefully available in the near future for our patients in need of epinephrine auto-injectors pens. The approval sets the stage for cheaper competition that may lower prices.

August is just around the corner and the new school year will be starting sooner than you think. Now is the time to beat the rush and to go see your friendly neighborhood allergist to get those school forms filled out and get new prescriptions for the epinephrine pens. Beat the back to school rush.

It's also a good time to come in to get evaluated for those seasonal allergies that you have been putting off and may have forgotten about. For those with Fall allergies, ragweed and weed season is also about to start in August. Call now at (571) 246-6323 for an appointment to be seen by a board-certified pediatric and adult allergist/immunologist. You can also visit us at

Busting Allergy Myths (w/Dr. Dave Stukus) Your allergy questions answered, LIVE!

Food Allergy Research & Education

Epinephrine pens are the only life saving medications that can effectively reverse a life threatening allergic reaction. They need to be readily available and everyone associated with the affected patient needs to be aware of the proper use of these vital medications.

A new study on how allergy patients carry and use epinephrine auto-injectors, published in the Annals of Allergy, Asthma & Immunology, found that fewer than half of survey respondents have an auto-injector with them at all times. Learn more about the study and its results on the FARE Blog

Red Meat Allergies Caused By Tick Bites Are On The Rise

Mammalian meat allergy caused by the bite of the Lone Star tick is a relatively new allergic condition but the cases seem to be rising. Not every tick bite will lead to this condition or the more common Lyme Disease, but it is one more reason to avoid ticks.
Typical food allergies are caused by allergic sensitization to a particular food protein. Symptoms usually are immediately after consumption of the offending food protein, without an arthropod intermediary.
Alpha-gal or red meat allergy is triggered by the tick bite with allergic antibodies formed to a sugar molecule found in the mammalian meat. The allergic symptoms after consumption of the red meat, typically do not appear for about six hours, which can further complicate the presentation. An allergist can order a special blood test that can help to confirm the diagnosis if the clinical history is consistent with a history of tick bites and delayed allergic reactions after eating red meat. Call (571) 246-6323 for an appointment. If you are bitten by a Lone Star tick, you could develop an unusual allergy to red meat. And as this tick's territory spreads beyond the Southeast, the allergy seems to be spreading with it.

[06/20/18]   The clinic will be closed on Wednesday, July 4th through Sunday, July 8th. We will open for normal hours starting Monday, July 9th!

The Spring tree allergy season is coming to a close and the grasses have already peaked. But ragweed and weed pollen season is right around the corner. The recent deluge of rain, that we have seen in the area, has kept the tree and grass pollen counts down. All the extra moisture in the ground makes the lawns bright and green, but it may also lead to a bad ragweed and weed season later this summer and into the Fall.

Summer is almost here. Schools in the area will be releasing students home for the summer soon. College kids may already be home. Now may be a good time to bring those kids in to get allergy tested if they haven't already been tested. And if they are a good candidate, starting allergy shots now may help them so that their symptoms are not so bad next Spring.

Board-certified and fellowship-trained allergists can also evaluate and treat food allergies, asthma, skin conditions, and drug/venom allergies in children and adults.

We honor the men and women who made the ultimate sacrifice and thank those that continue to serve in defense of the freedoms that we all enjoy!

On Memorial Day, we pause to remember service members who have made the ultimate sacrifice.

Ashburn Allergy, PLLC, Ashburn

Hoping to get the word out about us and that we are accepting new appointments for children and adults. Find us at or call (571) 246-6323. 1 neighbor recommends Ashburn Allergy, PLLC on Nextdoor.

Here is an updated graph from Sue Kosisky at USACAEL (Official pollen counter for the Metro DC area). I quick shout out to Sue and Mariko Marks for their selfless service. The National Allergy Bureau is made up of volunteers around the country like Sue and Mariko who collect the pollen and perform the tedious task of counting the pollen and spores to provide the pollen counts that you hear on the TV weather stations.

The graph shows nicely how late the tree pollen peaked and also how high it got this year. People affected by the tree pollen definitely felt the effects of this year's late and high tree pollen counts.


Look at the clouds of pollen released from this tree. Individual pollen grains are microscopic; but during the peak release times, the pollen aggregates to leave a visible film on everything it encounters. It also gets in your eyes, nose, and lungs causing the classic allergy symptoms. (571) 246-6323

Seasonal allergy suffers, consider this your trigger warning. Here's just how bad the pollen count has been in Millville, New Jersey. According to the Asthma Center, trees in the area were seeing pollen counts in “extreme” range, its highest designation.

We are in the process of renovating the office space in anticipation of our grand opening in April 2018

We are in the process of renovating the office space in anticipation of our grand opening in April 2018

The team

Happy Nurses Week To Two Awesome Nurses!!

As our patients can attest, these two hard-working young women are the driving force of our clinic. They set the standard for great nursing care by providing compassionate and effective patient care. They will greet you with a smile and make sure that your visit is comfortable and stress-free. We are fortunate and lucky to have such amazing nurses.

EpiPen shortage: What should you do?

There has been a lot of news coverage recently about the Epipen shortage. The shortage is specific to the Epipen brand and its generic which is made by the same company, Mylan.

It is NOT a shortage on the medication, epinephrine. There are other brands that are widely available, that provide the same level of protection.

Talk to your physician and specifically your allergist and we can find you an alternative if your Epipen is expiring soon. Call (571) 246-6323 or visit us at If you carry one, check the expiration date and plan ahead

As we wrote about earlier this week, the first week in May is turning out to be our peak tree pollen week for the year. Here is a graph courtesy of Sue Kosisky(USACAEL), showing the pollen counts compared to previous years. #pollenalert #nova #ashburnallergy

[04/30/18]   Metro DC area: Very High Pollen Alert this week.

It will be sunny and warm with a breeze! That is the perfect setup for the trees in the area to finally release their pollen in abundance. The oak trees should be very busy this week. Car washes should be very busy getting the yellow coating off the cars!

American Academy of Allergy, Asthma, and Immunology

Here is a good reference guide to all the medications available for allergies and asthma put out by one of our national allergy and asthma organizations. Table format with pictures and generic options.

The AAAAI has created a reference guide of FDA approved prescription medications that are used to treat allergies and asthma. You will be able to view each medication by the generic and brand name.

Traditionally the end of April marks the peak of the Spring tree pollen season in the Metro DC area. On average, the highest tree pollen counts are usually observed in the 3rd or 4th week of April. This year with the wacky weather, it looks like we are going to see the peak happen sometime in May. Unfortunately, for those with Spring allergies, the worst is yet to come.

Now may be a good time to come in to get tested and see what options are available. Call (571) 246-6323 for an appointment.

[04/21/18]   Pollen Alert!! Very high pollen expected this weekend with the temperatures in the 60’s the next couple of days with sunny clear skies!

Want your business to be the top-listed Clinic in Ashburn?

Click here to claim your Sponsored Listing.





20955 Professional Plaza Ste 300
Ashburn, VA

Opening Hours

Monday 10:00 - 18:00
Tuesday 07:30 - 14:30
Wednesday 10:00 - 18:00
Thursday 10:00 - 18:00
Friday 07:30 - 14:30
Other Ashburn clinics (show all)
Niyan Medspa Niyan Medspa
21001 Sycolin Road, Suite 220
Ashburn, 20147

Niyan Medspa is a physician operated service providing aesthetic procedures to the skin, helping you feel and look your very best.

Stephanie's Essential Suggestions Stephanie's Essential Suggestions
44927 George Washington Blvd, Ste 250
Ashburn, 20147

Learn how to use essential oils and self-hypnosis to improve your mood, thoughts and overcome blocks. It's easier than you think to feel better!

Airrosti Airrosti
43150 Broadlands Center Plaza Suite 184
Ashburn, 20148

Airrosti specializes in delivering quality, outcome-based musculoskeletal care. Stop living in pain and schedule today!

Animal Medical Centers of Loudoun Animal Medical Centers of Loudoun
43330 Junction Plz Ste 172
Ashburn, 20147

We're your other family doctor! We help you make the best decisions for you and your unique pet. Also have a holistic veterinarian, Dr. Grasso, on staff.

Better Morning Better Morning
44355 Premier Plaza #120
Ashburn, 20147

Adult, Adolescent, Couples, and Addiction Counseling.

Family Therapy Center of Northern Virginia, llc Family Therapy Center of Northern Virginia, llc
44081 Pipeline Plz, Ste 225
Ashburn, 20147

Family Therapy Center of Northern Virginia is a family counseling practice that offers counseling services for the entire family. From play therapy to art therapy to traditional talk therapy, we see kids as young as 3, teens, adults, couples & families.

Oilssentials Oilssentials
20937 Ashburn Rd Ste 147
Ashburn, 20148

Oilssentials, LLC is a company established to provide personal health and wellness consultations and education to those seeking natural solutions.

Restore Physical Therapy & Wellness Restore Physical Therapy & Wellness
44927 George Washington Blvd
Ashburn, 20147

Setting the new standard in Physical Therapy.

Healthy Kids Pediatric Center Healthy Kids Pediatric Center
44365 Premier Plaza Suite 220
Ashburn, 20147

A Harmony Home Care A Harmony Home Care
20130 Lakeview Center Plaza
Ashburn, 20147

Live-in care, personal care, companion care, skilled nursing care, post hospital/surgery care, medicaid waiver programs in Ashburn, VA.

VIP Esthetic Studio, VIP Esthetic Studio,
Morven Sq
Ashburn, 20147

Our mission is to create lasting beauty and confidence through passion, dedication and excellence so our guests will look and feel amazing. Home studio.

The Beauty Lounge by Cynthia Alva The Beauty Lounge by Cynthia Alva

Arbonne is dedicated to bringing you beauty, health and wellness through our vegan-certified products.