What is the cause of butt acnes and how can you pr

I have butt acne. I use Neutrogena grapefruit body wash which helps, but I still seem to get one or two. I hear that laundry detergent can cause this, so what ingredients should I avoid? I shower daily so I don't know why this is happening. I do stress alot so could that be it? Also I use this body moisturizer that has aloe Vera & non oily, could that still cause acne? I even do my best to eat right, but after a while of eating junk food I notice this happens. Please answer!! I need help!! There is no way I'm goin to a dermatologist, its too embarressing!!! I need a way to fix this myself & fast!! Also if theres a moisturizer that has ingredients specifically designed for acne & is for the body let me know!!