Hi..Several ingredients were found to be safe and effective for self-treatment of dandruff and seborrheic dermatitis. Salicylic acid, selenium sulfide, zinc pyrithione and coal tar are effective in treating both conditions while sulfur and ketoconzole are effective in treating dandruff only and hydrocortisone is effective for seborrheic dermatitis..The following medications are used in the treatment of acne... Retinoid-like agents ,Antibiotics,Selectivealdosterone antagonist,Acne products, When a topical or systemic antibiotic is used, it should be used in conjunction with benzoyl peroxide or topical retinoid to reduce the emergence of resistance...avoid junk foods,carbohydrates like rice etc,avoid oily foods...add proteins and fibre rich foods to your diet with green tea,green leafy vegetables, fruits... Many procedural treatment options are there...consult dermatologist they will do the needful