Should the skin between my buttocks be pink or kinda dark? no itching or other symptoms. i did have a yeast infection in the past and was on some antibiotics creams in that area. thanks?

Usually the skin between the buttocks should be the same color as rest of your skin, though people with a darker complexion have skin between the buttocks, on elbows, and knees that is darker. Prior inflammation can also leave a post-inflammatory increase in pigmentation. It would be important to maintain a healthy weight and not worry about the skin color.