The best thing he can do is get himself along to the local GUM clinic, it'll be in the phone book or on the internet under his local primary care trust. It can be anonymous then if he wants. The GP certainly can deal with things like this but will refer him if it's more complicated - and the longer your mate leaves it a) he'll get more worried and b) it could get worse. Does he still have contact with the woman? - because if it is an STD, she'll need to get checked out too, or risk passing it on (and that applies to both of them). Tell him not to be embarrassed, the medics and nurses will have seen it all before - but tell him not to hang about either.