pimples usually a Puberty problem.Majority of youth will get during this period,due to harmonal changes.In few people,after some time automatically will b normal.But few will b suffred for long.Acne(pimples) also wud b due to Excessive oil secretion from skin pores,sebum secretion,pollution, dust exposure,heriditary.U need to take care by often washing with mild soap.Apply daily neem leaves paste with a pjnch of turmeric will help much.Take more water,fruits.Avoid oily,spicy,junk,fast,baked food.U can also aply mint leaves paste+lemon juice twice/day r alovera gel. Paralally u can take Homeopathic T/t ,if any Pcod,Thyroid problems u hav,as those also will cause getting acne.