First of all let me say if you think you've caught something see your doctor or go to the GUM clinic !
Blotchy red sore patches on your bellend , exacerbated by acid in your urine ,and just too much playing with yourself, now fairly obviously the wg isnt going to want to give that a good sucking is she? Get yourself down to Boots, less than four quid hydrocortizone cream , sorry but you will have to ask for it, if they say anything just say you've got a little bit of eczema flared up again ,and that you have had it before.
Spread a small amount on the area concerned, leave it alone . No I said leave it alone! 24 hours later it will all be better again, and then you can say a silent thank you to your old mate Joe.