Large boobs and i get painful boils in between them, what is causing this, what can i do to prevent them and how do i get rid of the scars they leave?

Acne: You are describing either a skin infection called folliculitis, which occurs in people with oily skin with increased bacteria on their skin, in situations of moisture, or in those who have acne. Folliculitis and acne both cause scars. I would seek consultation with a dermatologist to see if topical or oral antibiotic therapy can prevent outbreaks and treat current infections.