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 photos by direct online consultation as it's a must to see which grade of pimples or acne for accurate diagnosis and treatment.

Sir/maam 11 years boy you are saying a lot of pimples as such acne is a problem that can be cleared but the treatment depends upon the severity There are some simple measures like reducing chocolates cool drinks ice creams Kurkure chips fast foods cakes precisely the foods which contain access carbohydrates which are  refined washing the face twice daily with a salicylic acid face wash might give you a good result