Medically reviewed by Brendan Camp, MD Key Takeaways Comedones are bumps on your skin caused by blocked hair follicles, leading to blackheads and whiteheads.Use oil-free and non-comedogenic products ...

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 ...