14-year-old boy, white skin, sensitive, if desired ลดรอยดำ from acne scars on the back. by making a spray on the back Can you follow the formula below? Lactic Acid (AHA) Neutralized 10% Distilled Water 90% If not suitable, please suggest gel or A formula. Non-greasy essence for ลดรอยดำ from acne on ...