Possibly a furuncle. You can only feel and tell if it is cystic acne. In any case antibiotic is indicated, Does not have features of anything vascular.My I know which has been prescribed?
Best wishes,
* I have also had trouble with it bleeding once when it was flat.
(I meant scraped)
edit to ad: it is quite flat against my skin. I have also had trouble with it bleeding once when it was flat. This leads me to believe that it's possibly a vascular issue. It reminds me vaguely of the hemangioma I had as a child.