Hi, thanks for posting your query,
It seems you have developed a boil (folliculitis
) in your arm pit , which is pus filled and you have been squeezing it causing further injury
leading to bleeding.
I suggest you not to squeeze it
you need to clean it with antisepic solution followed by application of antibiotic ointment like mipirocin
you may take oral antibiotic after getting it examined by dematologist ,if he feels the need.
An antinflamatory tablet will help in reduction of pain snd swelling
maintain good hygiene to prevent recurrance
skin tag is a skin outgrowth present in in 90% of total population, commonly seen in body folds like armpit groin neck aroud eyes . they are painless but cosmetically unacceptable, and are rich in blood vessels so they bleed easily due to friction or picking .
they can be easily removed by minor procedures like:
chemical , electric or radio cautery
so dont pick skin tags
, get it removed by a doctor
Hope this answers your concern