If you go to your local hospital, they should have a Genital and Urinary medicine clinic (G.U.M.) where you can be checked and tested for all types of STD's. You do not have to use your real name either.
Alternately, you could look at the photographs of STD's on the attached site and compare the images with your boyfriends problem. Please note that some of the images are unpleasant. I would suggest you start with the herpes virus and move onto genital warts before delving any deeper. I hope you are not offended by anything on view. Best wishes.
http://www.herpes-coldsores.com/std/pictures.h tm