What Causes Small Itchy Bumps On Foreskin Of Penis?

I am a male adult aged 40.I masturbate ocassionally but I have noticed that there is a tendency to develop some small itchy bumps on the foreskin(usu. 2).some watery substance come out if you squeeze .Two months ago I was prescribed some erythromcyn since I had developed some boils on the legs(at times they disappear on their own)