About a week ago I noticed a hard small lump half way up my penis. There was no pain or irritation. The next morning it was larger and red like a pimple. The next day it looked like a large black head and was sore when pressure was applied. It broke and pus came out.
The next morning it had almost completely dissapeared and now seems to be healing fine. I am sexually active but have experienced no other symptoms.
I intend to go to a clinic as soon as possible, but I am very worried about what it could be. Has anyone experienced this and found that it wasn't an std?