Vitamin B2 is used to treat seborrheic dermatitis. Acne is not necessarily seborrheic dermatitis and cannot be generalized. It won't work on its own. 1 Eat less spicy food, eat more fruits and vegetables and drink more health porridge. Exercise more to promote metabolism. Wash your face with pure natural Asa Milla olive soap, which is very popular now, instead of using chemical cosmetics. Severe cases can be treated with traditional Chinese medicine.