Hello, You are suffering from dry skin of the head of the penis, the skin is irritated. You had unprotected sex with a friend. To prevent dry, irritated skin on the head of the penis avoid using drying soaps. Use lubrication during sex, buy water based lubricants. It can also occur as an allergic reaction to the condom used. Use latex free condoms. If you have an allergic reaction to latex, spermicide, personal deodorant, or fragrance, you may experience dry skin on the penis. If you do not maintain good hygiene your own semen can cause skin irritation. Men who are allergic to latex may also have a red, itchy rash, or swelling on their penis after wearing a latex condom. Use of lubricant during prolonged sexual activity can make sex and masturbation more comfortable, and help you avoid dryness. Avoid wearing tight clothes, they can chafe or rub against the skin, and lead to dryness. Tight underwear can also lead to a buildup of moisture under your foreskin, which can cause fungal infection. It can be treated by applying antifungal ointment. Wear soft, supportive cotton underwear, and looser clothing in light, breathable fabrics. Penile yeast infection can also cause similar symptoms. Applying imidazole (Canesten, Selezen) ointment or clotrimazole (Lotrimin AF) ointment on the affected area can heal the area affected. You should abstain from sexual activity until the infection has been cleared as it is contagious and you could spread the infection to your sexual partner. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician