Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Blackhead
Medically reviewed by Min Clinic Staff | Updated: January 2026
Blackhead: A familiar term for what is medically called an open comedo. A comedo, the primary sign of acne, consists of a widened hair follicle filled with skin debris, bacteria, and oil called sebum. A blackhead has a wide opening to the skin and is capped with a blackened mass of skin debris. In contrast, a closed comedo, commonly called a whitehead, has an obstructed opening to the skin and may rupture to cause a low-grade skin inflammatory reaction in the area.