Comedones are a type of acne that occurs when hair follicles in the skin become clogged by oil, dead skin cells, and debris. This causes small bumps commonly known as blackheads (open comedones) or ...

Comedones are a common type of acne. This term refers to clogged pores, which look like small bumps in the skin. If the comedones are due to prolonged sun exposure, they’re called solar comedones. But ...