a couple of days ago i noticed white two or three blisters that where white and a tiny bit puss coming out then a little bit of days pass and it’s a big white blister with a dark brownish almost blackish coloring on it with one smaller white blister and more puss has been coming out i want to know what it is one of my online doctors assured it’s a infection non sexual by the way but still would need to have to be checked up on .