The high vitamin C and bromelain content of pineapple juice make it an effective acne treatment. Bromelain is an enzyme that softens skin and has been used for hundreds of years in South and Central America to fight inflammation and swelling. Drinking pineapple juice helps the body synthesize collagen, which helps skin stay firm and flexible, while vitamin C and amino acids aid in cell and tissue repair. For a double dose of skin nourishment, cut a pineapple in half and refrigerate one half. Scoop the fruit out of the other half, juice it, drink the juice and gently rub the inside of the pineapple skin on your face, avoiding the eye area. After a few minutes, rinse your face thoroughly with tepid water. Repeat two or three days later with the other pineapple half.