Acne problem

After having few days of busy life, finally my life is back to normal. However, i have to start my diet plan all over again because i have gained 2 kg in just 5 days, and i have to gain back my energy by resting more. Have not sleeping well recently and that's why i am suffering acne problem now. Was told salicylic acid can help eliminating those irritating and ugly acne, perhaps i should just get it from pharmacy. Hope to get back my smooth and fair skin soon.