Acne is a common skin condition caused by blocked hair follicles. When sebum, the oil that keeps skin moist, and dead skin cells clog pores, pimples or zits form. These breakouts usually affect the face, but they can also affect the back, chest, and shoulders.
Acne is skin inflammation. We have sebaceous (oil) glands and hair follicles with fine hair. Sebaceous glands secrete sebum from the follicle through a pore in healthy skin.
Furrows are lined by skin cells called keratinocytes. Normal skin cell shed causes keratinocytes to climb to the surface. However, acne causes hair, sebum, and keratinocytes to clog pores. This reduces keratinocyte shedding and blocks sebum from reaching the skin. The oil and cells in the clogged follicles allow germs from the skin to grow, producing swelling, redness, heat, and discomfort. After the clogged follicle wall ruptures, germs, skin cells, and sebum enter the skin, forming lesions or pimples.
The majority of people with acne clear up by their thirties, but others still struggle in their forties and fifties.