There is little discoloration (somewhat black) in the tip of the skin and surrounding areas. There is no pain while urinating.  Now I am also feeling little irritation in the tip of the skin even if it is not erected.  Sex or no sex irritation in the tip of the skin is there .  Is it beginning of skin cancer or any kind of STD.

3 weeks before I had a painful, hard and red boil/brusie in my nose for which doc. give me antiboitic containin Amoxicillin and Clavulanic acid for 7 days. After taking 5 days medicine it disappeard. However, one more appeared in my left armpit after 7 days. I had not taken further medication, only applied an antibacterial talcum powder twice a day after bathing. Now it is somewhat disappeared.  However, yesterday one more boil/bruise appeared in my right armpit. I am totally confused. I think there is an bacterial infection in my body.  I have also headaches in these days.  For controlling this I am taking painkillers now and then.

Kindly advice. If you have any quries I can answer you. Please let me have your reply.

I shall be thankful to you sir.