Suggest Treatment For Painful Blisters On Foreskin While On Prednisone For Sinus Infection

Question : Hello, just recently I was giving SMZ/TMP DS 800-160M and Prednisone 10 mg for a sinus infection I was dealing with... a couple of days later I noticed my penis was real sensitive to the touch around my foreskin on the underside... then a day later my skin turned reddish blackish blue and I noticed blisters started forming. Needless to say its very painful. I have been married 26 yrs and have never had an STD. It doesn't hurt to pee but the skin underneath is very sensitive and burns at times. It just came on within a couple of days of taking this medication. Could I have had a reaction to the meds? And would and antifugal cream or hydrocortisone help me with the pain and the blisters?

So will the Clotrimazole-Betamethasone 1-0.05% External Cream that was prescribed for my problem help me or should I go back to my doctor and ask for something else? I don't believe it is phimosis or paraphimosis because I never have had an issue with retraction of my foreskin either pulling it back or during an erection, neither has it ever been really tight around the head of my penis. Like I said no problem with that. By the way the blisters that I have gotten now show and look like water blisters that break and then get a greenish residue when I clean them before I use the cream that I was given. My penis is still dark reddish, blackish bluish on the right side and underside. It is still really sensitive to the touch there. I have now had this for about a week and a half. Should I seek further medical help? And as for the SMZ/TMP DS 800-160M generic for Bactrim I did some research and found that some people do and can have a allergic reaction to it and the use of sulfamethoxazole. Sometimes coming out in rashes and blisters in the genital area... Any more suggestions would be appreciated... Thanks...