I've developed a skin rash that began on my inner thighs and now has spread to my shoulders, ankles, buttocks, and the side of my stomach. It started out red and has turned black, with little itchy bumps. Should I be worried about this, and what could be causing it?
It sounds like you may be experiencing a fungal skin infection, such as tinea corporis (ringworm). I recommend using an antifungal cream like Clotrimazole 1% cream. Apply a thin layer to the affected areas twice a day for 2-4 weeks. Additionally, you can take an oral antihistamine like Cetirizine 10mg once daily to help with the itching. Make sure to keep the affected areas clean and dry, and avoid sharing towels or clothing to prevent spreading the infection.