01/12/2026
Sebaceous Filaments vs. Blackheads — Not the Same Thing 🧬
Sebaceous filaments are normal anatomical structures. They’re tiny channels that line pores and help transport sebum (oil) from the sebaceous gland to the skin surface. Because they’re filled with oil, they often appear gray or yellow and refill quickly after extraction.
Blackheads, on the other hand, are a form of acne (open comedones). They occur when a pore becomes clogged with excess keratin and sebum. The dark color isn’t dirt—it’s oxidation of the material when exposed to air.
✨ Key difference:
Sebaceous filaments = normal + continuous
Blackheads = pathologic + clogged
Treating them requires different strategies, which is why proper diagnosis matters before choosing products or procedures.