Hi,Anuj thanks for query.This is a common problem of growing adult.Pimples
happen becuase of pores of skin are blocked by dust or something and then they get infected.Hormonal
changes,too much of fat in diet,poor hygeine all triggers development of acne
.Please wash your face with good antiseptic soap after coming from out side,avoid too much of fat in your diet.In case of infected pimples please visit your doctor for course of antibiotics.
wishing you good health.