Some pimples pop up overnight with little to no warning. Others make their arrival known long before they ever come to the surface by causing a painful lump. The latter is typically a big pimple ...

While we all try to avoid pigmentation and acne, sometimes we notice ... Milia develop when oil, dead skin cells, and keratin get trapped under the skin’s surface, forming a bumpy layer.

Cystic acne occurs very deep under the skin's ... They are tiny, harmless cysts that occur when dead skin cells get trapped under your skin, says Dr. Schlessinger. “Picking at them often has ...

Human botfly larvae, for example, burrow under your skin, forming a pus-filled pimple. Meanwhile, thousands of young Loa loa worms can travel throughout your body —even across your eyeball!

Pimples can be embarrassing ... sweat, and dead skin cells. This creates an infectious breeding ground for bacteria which get trapped in the follicle and have no way to escape.

Shaving can sometimes cause razor bumps, red, itchy, and inflamed spots that occur when shaved hairs grow back into the skin ...