<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi Dr Grief. I am a 24 year old female and have a red elliptical behind my knee. It started off a a rash: all the elipse was red and ow, after a couple of weeks, the centre cleared out and the outside remained red, forming a ring.What could this be? Could it be related to stress?  <response>: Hello, Thank you for posting on Chat Doctor. It seems you are suffering from Tina corporal, a kind of fungal infection. I would suggest you to consult your dermatologist for proper management of the condition. I usually recommend proper course of oral antifungal Chat Doctor. You can additionally use antifungal dusting powder containing ketoconazole during daytime and a soap containing ketoconazole for rinsing of affected areas. Take oral antihistamines for itching as required. Maintain hygiene over those areas and avoid wearing tight undergarments. Hope your queries are resolved and wish you best of health. Kindly spare some time to rate my answer and 