Acne or  pimples... Due to hormonal changes..Oily skin causes it...Common in adolescent age...May occur in adults also.. Food like Oily foods, ice cream, chocolate and sweets increase it.. Treatment depends on the grade of pimples or acne..So, please  send more photos by direct online consultation as it's a must to see which grade of pimples or acne for accurate diagnosis and treatment.

That alone may not be enough, given the images there is also some scarring seen. Please consult online as a bit more information is needed for the right type of treatment along with diet and skin health. Also, should you consult attach before and after images since the start of acne.

Salicylic acid alone will not be sufficient fo your acne. Few other medications are needed as well. It's also important to know your skin type for the treatment. Kindly consult online for detailed discussion and treatment