Deborah Spey. Blackheads turn black when exposed to air and oxidize, hence their name. These clogged pores are commonly found on the nose, forehead, chin, back and chest since they are sebum rich ...
Blackheads are most common in areas of the skin that have more sebaceous glands, which produce oil. The highest concentration of these glands are found on the nose, chin, neck, back, and chest ...