Pimple Under Armpit Lump. When the pimple is infected it can develop into a cyst or lump that can be painful and tender when they are touched. Lymph nodes are an important part of the immune system and can swell when the body is fighting off an infection or dealing with an injury.
An armpit lump or axillary lump is often caused by swollen lymph nodes in the armpit. Lymph nodes are an important part of the immune system and can swell when the body is fighting off an infection or dealing with an injury. An armpit lump or axillary lump is often caused by swollen lymph nodes in the armpit.
Pimples under the arms can be folliculitis which can be caused by a bacterial infection.
The bumps start as small armpit pimples and can grow into cysts then large bumps. A small or pea-sized lump in the armpit can also be caused by a skin infection like a cyst or ingrown hair. In the armpit the most common cyst is an epidermal inclusion cyst. Pimples or pimple-like bumps in your armpit could appear as a small rash with a collection of bumps or you might just have one or 2 pimples.
