Causes Of Pimple Under Armpit. HIV-AIDS measles mumps chicken pox varicella shingles herpes zoster also can cause armpit lumps to appear in some men. A pimple under armpit could be due to improper shaving technique ingrown armpit hair clogged skin pores bacterial infection and excess sweat.

Shaving and other types of skin hair removal are the main reasons for the growth of ingrown hairs. Women usually remove their armpit hairs more and suffer the problems of pimples more frequently. These can cause painful reddened swellings called abscesses or boils.
Popping giant pimple in armpit.
Lumps in one or both armpits may be the result. The causes can be sweat dirt dust bacteria hormone your bad psychology condition and some others. Causes Either blockage or infection of the hair follicles in the armpit cause pimples in this area Waldman says. Armpit boils are highly treatable and typically not life-threatening.