Hello Sir I am having one red blister on my penis (below the head). it developed 10 days back .. i masturbate a lot.. say about 5 times a day for nearly 6 months.I do masturbation hard without any lubricant. After masturbation the penis head becomes dry and sore. I have masturbated with a condom 2 weeks before. Before that i did not have this blister. This blister is having burning sensation(not very high and not all times) now. I have had protected sex(using condoms) with sex workers couple of times before .I have not done any oral sex with them at all. Apart from these there are 2 blister (actually they are not blisters when i pull the skin these seem to be not there ..but without pulling the skin ..they seem to be there. these two are on the nerves of the penis. these are not painful or any burning sensation. Please guide me what to do.