<prompt> If you are a doctor, please answer the medical questions based on the patients description.I had a unprotected sex with one of my colleage exactly a month back. I had small rashes on my penis after the sex and lasted for 15 days. I took some antiobotics to cure, it worke and now am terrible itching in my back neck and some parts of my body. I dont see rashes on my body still itchng worries me, could this be a HIV??  <response>: Hello, Rashes on the penis other parts of the body after unprotected sex are indicative of STI. You are suggested to visit ER get STD tests done to stay on the safer side. Your treatment will depend upon the severity of the infection detected. You may need a course of antibiotics or antivirals. Avoid multiple partners unprotected sex at all times. Genital psoriasis, Contact dermatitis, Syphilis, Yeast infection, jock Itch or scabies can be easily contacted during unprotected sex or oral-anal sex. In the meantime apply Scabies cream all over the area affected leave for 30-40 minutes then take a shower. Repeat it after 10-15 days. Do not share toiletries. Wear cotton clothes. You can apply HY Chat Doctor. Hope I have answered your query. Let me know if I can assist you further. 