At the top of my bum crack i get/have an extremely itchy, circular, raised, rash with white spots. have had it at least 6 times in 2 years, in the exact same spot!?

Rash- need addle inf: There isn't enough information here. It could be a recurrent dermatitis (possibly seborrheic), fungal, or viral. How long does the rash last? Is there any pain, burning or itching?

Pilonidal cyst: This could be pilonidal cyst have a surgeon or wound care specialist take a look. They can either remove this or locally treat for infection and or inflammation. Have this checked.

Localized psoriasis: Some possibilites include mild psoriasis, irritation or mild yeast (candida) infection.