What is a closed comedo?

Closed comedones are, in fact, a subtype of acne. They primarily manifest as small, white, raised lesions on the facial skin surface—resembling white papules. The material within these lesions is sebum and keratin debris, giving them their characteristic white appearance. Closed comedones develop when sebum produced by local sebaceous glands fails to be effectively expelled from the skin surface, leading to accumulation and formation of these white, pinpoint lesions. Clinically, this condition represents a form of common (or “ordinary”) acne. Treatment typically involves topical application of keratolytic agents, which help dissolve keratin and facilitate the expulsion of comedonal contents from the skin surface. Alternatively, comedones may be manually extracted using a comedone extractor—both approaches are effective.