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Your skin has small holes called pores which may become blocked by oil, dead skin cells bacteria, and dirt. Due to this, you may develop a pimple or “zit.” It most commonly occurs on your face, neck, back, chest, and shoulders. If you are having acne, you’ll usually notice pimples that are white or black in appearance. These blackheads and whiteheads are basically comedones. Some comedones develop inflammatory changes and turn red and these are more likely to give scarring to your skin.

Different types of acne lesions that can occur are:

Papules - tiny red, raised bumps due to inflamed or infected hair follicles.

Nodules- painful, solid lumps under the surface of your skin.
Pustules- small red pimples with pus at their tips.
Cysts- large lumps found below your skin, containing pus and are generally painful.
Causes
Every pore on your skin is the opening to a follicle. The follicle has two parts, a hair and a sebaceous gland. The sebaceous gland secretes sebum (oil), which goes up the hair, out of the pore, and onto the skin. It keeps your skin lubricated and soft. Multiple factors contribute to acne like

Abnormal sebum production by your pilosebaceous unit

Abnormal sebum production by your pilosebaceous unit
Abnormal keratinization leading to dead skin cells collection in your pores
Bacteria build up in your pores
Inflammation
Risk factors
hormonal changes due to puberty or pregnancy
Some medications
Eating too much junk food (high glycemic food)
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