According to dermatologist Ted Lain, MD, cystic acne is characterized by large, pus-filled cysts under the skin's surface that can be red and painful. It's commonly found on the face but can also ...

Ever had small, painful lumps that form under the skin? Did you think they were pimples and waited for them to resolve on their own? That could be the case, unless they only heal slowly, recur, and ...

If left untreated, these pimples can form sunken, atrophic acne scars on the face. Keep reading to find out exactly what under-the-skin pimples are, what causes them and how to properly treat them.

Cystic acne occurs when oil, skin cells, or bacteria get trapped in your hair follicles and pores. This leads to nodules (lumps) under your skin that may become red or discolored, swollen, or painful.

If left untreated, these pimples can form sunken, atrophic acne scars on the face. Keep reading to find out exactly what under-the-skin pimples are, what causes them and how to properly treat them.

"Severe types have larger, inflamed cystic nodules that can be painful and result in pitted severe acne scars, as well as hyperpigmentation and dermal skin atrophy," Dr. Rossi tells PS.