What causes redness in area where sperm was spread during masturbation?
Patient: Hi, im 28 male 5.8 and 128. I was pleasing my self sexually and I came over my chest and stomach. After shower, I notices redness in my skin where the sperm was? this is the second time  i notice that. What is the reason for that, and is there any treatment.  Thanks Doctor: Hello and Welcome to ‘Ask A Doctor’ service.  I have reviewed your query and here is my advice.  Is there any itching? Does it disappear immediately.? Possibility of allergy has to be kept in mind. Need further evaluation.  Hope I have answered your query.  Let me know if I can assist you further.