Blackheads can be a problem from puberty until early adulthood for many individuals.
Parts affected Any hair follicle may become blocked with debris. However, blackheads usually appear on the face, chest, upper back, and shoulders. These parts of the body have comparatively high concentrations of sebaceous glands, the tiny chemical factories that secrete sebum into the hair follicles. Related symptoms Anyone may experience an occasional blackhead. However, blackheads are most often associated with acne .