URL of this page: http://www.nlm.nih.gov/medlineplus/ency/imagepages/2088.htm

Blackheads (comedones) close-up

Blackheads (comedones) close-up

Overview

Blackheads, or open comedones, are common in acne. Clogged hair follicles reflect light irregularly to produce this black hue.

Update Date 11/20/2012