Oil production in the sebaceous glands increases during puberty, causing<unk> nes and acne to be common in adolescents. Acne is also found premenstrually and in women with polycystic ovarian syndrome. Smoking may worsen acne. Oxidation rather than poor hygiene or dirt causes blackheads to be black. Washing or scrubbing the skin too much could make it worse, by irritating the skin. Touching and picking at<unk> nes might cause irritation and spread infection. What effect shaving has on the development of<unk> nes or acne is unclear. Some skin products might increase<unk> nes by blocking pores, and greasy hair products (such as pomades) can worsen acne. Skin products that claim to not clog pores may be labeled noncomedogenic or nonacnegenic. Make-up and skin products that are oil-free and water-based may be less likely to cause acne. Whether dietary factors or sun exposure make<unk> nes better, worse, or neither is unknown. A hair that does not emerge normally, an ingrown hair, can also block the pore and cause a bulge or lead to infection (causing inflammation and pus). Genes may play a role in the chances of developing acne.<unk> nes may be more common in some ethnic groups. People of Latino and recent African descent may experience more inflammation in<unk> nes, more<unk> nal acne, and earlier onset of inflammation.
Comedo
Wart
Scruple 
Purell
Superbill
Serenic
Rosette 
Aidoc