Hello, and thank you for posting on Healthcare Magic!
You have mentioned several things that are concerning. First of all, anytime you notice a strange
rash, discharge, swelling or bump on your partner's genitals, you should not have sexual contact with him/her until a doctor has examined it. Anything of this nature should be assumed to be a
sexually transmitted disease until proven otherwise.
Secondly, your boyfriend needs to be seen by a doctor immediately. Do not have sex with him until he does. A painless bump on the penis is most likely
syphilis. This is a very contagious sexually transmitted disease that you are at high risk for catching from him. Even if this is not syphilis, I can tell you that this did not happen because his penis kept coming out during sex.
Lastly, please let your boyfriend know that under no circumstances should he put
hydrocortisone cream on his penis.
Steroid creams such as this can cause thinning of the skin, and use on the genitals is not recommended.
I hope I have given you some useful information, and wish you the best of health.
Sincerely,
Dr. Kinney