Rash?

so ive has this rash looking stuff right at the start of my butt cheeks for like two week. does anyone know of any medicine or anything that would help or if its even a rash and what kind of rash?

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Looks like a fungal infection. Ask your chemist/pharmacy for fungal cream containing Clotrimazole. Wash the area daily and dry thoroughly. At night rub the cream in thoroughly. May take a week to clear up but you have to persevere. Also try washing the area with a dandruff shampoo containing Selenium Sulphide.
Wash all your underwear at 60 degrees minimum and make sure it is 100% cotton and not nylon/lycra. Dont wear pants at night.

Its quite common.

looks fungal