Hello Pimples commonly occur at your age and it is due to blockage of oil from oil glands of the skin, under hormonal influence. Certain factors which may aggravate pimples are stress, oil based occlusive cosmetics and food items like sweets, milk and other dairy products. Pimples usually leave behind spots and chances of dark spots & scars increase if you fiddle with them. You need proper treatment to control pimples and maintain the results. Visit a qualified dermatologist nearby. Dr Vijay Adhe Eternis Skin & Hair Clinic