Armpit lump with pus

Hi, Sos, I’m scared because recently(3 ish months ago) I have notice a lump in my left armpit and I tried to pop it and it came out with pus the first time, then i did it a couple of more times because it doesn’t hurt me, lately I decide to let it be and it I started to reduce its size and color but out of curiosity I decided to pop it again and it came out with more pus than usual and I think it’s internal because it doesn’t feel like a bump is just there pretty noticeable but not like a pimple. I’m worried because I’m overthink that it could be breast cancer but I didn’t find anything about pus in armpit while searching. Has this happen to someone before? (Btw I’m 19)..you can see in the photo that is pretty small, and it only turned darker because I pop it but normally is lighter.