Blackheads are a type of acne . They’re open bumps on the skin that fill with excess oil and dead skin. They look as if dirt is in the bump, but an irregular light reflection off the clogged follicle actually causes the dark spots.
Blackheads typically affect teenagers and young adults undergoing hormonal changes. However, many adults continue to have acne into their 20s, 30s and beyond. Some even develop blackheads for the first time as adults.