What the fuck is wrong with my penis?

There is a black bubble on the head, filled with old blood i believe. It's not like, swollen or anything, just a black bubble of dead blood. Could it be from fapping too much, or something else? I had the same around a year ago, when my GF moved 100 miles away (We had phone sex 3-5 times a day).

Or is it just random? Help me out lounge.

AND REPLACE IT WITH ANOTHER ASS. M-M-M-ULTI SHIT.