<s>[INST] Hello,My girlfriend has a rash, below her belly button. The patch of skin is tough, almost scar material in nature.  It is usually tolerable but seems to aggravate when foreplay is initiated and she scratches it, incessantly, subsequent to intercourse?  Shes had it, since before we started dating, almost two years now; we thought it might be a nickel allergy but no treatment seems to make a decisive improvement. It is obviously of serious discomfort, to her, any thoughts? [/INST] Hi, Welcome and thanks for posting your query to Chat Doctor. After reading your query it seems your girlfriend is suffering from Lichen simplex chronic us. It is a condition of skin where there is a vicious cycle of itch - scratch and itch. So once you start scratching it causes more itching, and it further aggravates the situation by scratching. As with defense mechanism of our skin, it gets thicker and thicker after scratching. So, in your girlfriends part, after your foreplay and after intercourse it initiates the urge to scratch and then the rest of situation as above. For the relief part, ask your girlfriend- DO NOT SCRATCH. She has to control her scratching tendency. It is very well treatable by steroid cream s and round the clock antihistamines under dermatological guidance. In between you can ask her to apply petroleum Kelly for multiple time a day. So be stress-free and relieve her tensions also !! With best wishes, Chat Doctor.  </s>