 [ Symptoms ] i have a rash on my upper inner thigh could be sti and spreading [ Disease ] hi it doesnt seem to be a sti it seems to be an allergic rash that is in its early stages apply local creams take anti inflammatory and anti histaminic tablets avoid friction or exposure of the concerned ares with irritant materials these should show signs of improvement in 4 5 days if there is no improvement consult a dermatologist thanks