butt acne??! 😩

I have bad acne as a whole, it's all over my & back... I'm on birth control pills to level my hormones, I'm vegetarian, I practically only drink water & cranberry juice, I wash my face... not sure what I'm doing wrong. 
anyways, I have blackheads on my booty? I shower daily & use a face wash on my body just because it's gotten so bad. 
I've asked many doctors & my dermatologist what they think it is but they insist it's not acne... however, with everything they've put me on... at least 5 different medications and it's still there. and that's just for my body acne. 
It's getting to a point where I'm seriously considering taking Accutane because nothing seems to help. accutane is a serious medication but I think my acne is just so freakin stubborn that it needs it. 
anyways... is butt acne normal? It's not really whiteheads and pimples, it's just deep blemishes & blackheads.