Rash on top of penis

I developed a red rash on the top of my penis. It only happens after masterbation (masturbation). I got scared and got a blood test for herpes and it came back negative for both type 1 & 2.  It slowly gets better if i don't touch my penis. I haven't had sex for 3 months. I know the partner and she is clean. is there a chance for a false neagtive? what else could this be and how do I cure it? Please help!

[Bhupinder Kaur, MD]

Hello,
Since the rash appears after masturbation, so chances of the rash being due to rash due to friction rub are more. Wash the areas several times with fresh water. Do not use any cosmetic products at the sites. You can apply some calamine lotion at the rash as it will help in soothing the skin. Also wear cotton undergarments. Application of mild corticosteroid cream and oral antiinflammatories like ibuprofen/acetaminophen are also helpful. If the symptoms are severe then it will be best to consult a dermatologist.
I hope it helps. Take care and please do keep me posted in case you have any additional doubts. Kind regards.