I have an itchy nickel-sized/shaped rash on the inside of my arm (the top of my bicep when I flex it). Its made of red spots that form the round shape. Theres a much smaller group of red dots an inch to the side. What is it? Have I been bitten by a bug? I recently (3 weeks ago) became sexually active with a new partner. Could it be an STD? I only noticed it this morning.
Hello, Thank you for posting on Chat Doctor. It seems you are suffering from Tina or candidiasis, 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