

Red and stingy lump in armpit.
first of all, sorry for the horrible pictures. I couldn’t figure out the phone camera despite being gen-Z.
Is this something like an infection or ingrown hair? I just started my period after getting mini pills (NOT birth control) due to possible endo. It appeared as a non-visible pea sized lump in the middle of my armpit a week ago, and now it has moved to (see the picture) and is pretty big. My skin is kind of peeling in the middle of it, like the loose skin you get on your thumb??
I’m very bad with measurements, but I’d say it’s maybe 2cm wide and like 1cm outward?? Long? I’m sorry English isn’t my first language.
It’s red, hurting like hell, I can’t close (?) my arm without pain, literally nothing can touch it without the most uncomfortable pain happening.
If it does look like something I could treat at home, or speed up the process, please tell me.
(I’m a minor, 5’9, and around 49kg. (108 or 118 pounds?)