Cysts (fluid-filled tissue pockets), infections, and swollen lymph nodes commonly cause armpit lumps. Finding a lump in your armpit can be worrisome, especially if it hurts or appears unexpectedly.

An armpit lump—or axillary lump—can occur as a symptom of many conditions that range from harmless to serious. It is often the result of an enlarged lymph node. While an armpit lump is a ...

The armpit is rich in sweat glands and the pores from these can become blocked, which may go on to become infected, causing a sore lump. Many of these do eventually go on their own, so leave it ...

a rash or redness A new lump, swelling, thickening or bumpy area in one breast or armpit that was not there before Discharge of fluid from either of your nipples Any change in nipple ...