A few months ago there is this small pimole like bump in my armpit that is not painful or red at all so I just ignored it. A few weeks later I saw it again and it developed a head thay is leaking a puss, so I tried to get rid of the puss but every time I see it its just leaking puss out but after a week or so it stopped leaking and now its just a bump that is is so black it looks so ugly. Wtf is it??