2 days ago I had a small zit/pimple like bump on the rim of my penis on my circumcision scar. It was originally very small and non-painful. After masterbating I noticed it had popped and had discharged. The next day it was very red, and also very painful to the touch. It does not appear like a blister or rough skin like herpes or warts. I think it is just an infected folicle or gland, but I am not sure. I have had a cebaceous cyst on my chest before and I am familiar with those, but my understanding is that is an infected hair follicle. This area of my penis has no hair so I don't think it is a hair follicle issue. Can it be some type of epidermal or cebaceous cyst even though there is no hair follicle there?