There are many reasons for pimples
like from pubertical harmonal changes to poor hygiene and food habits. According to ayuveda pimple are because of pitta and blood impurities. Reason from this may be improper food, poor hygiene, poor sleep, constipation
, excess oily friend spicy food and many more.
I will suggest you some common measure to follow like wipe your face with warm water 2/3 times a day. Use gental
soap for cleaning face only at night. Drink atleast 2/3 lit of water per day. Eat leafy vegitables and fruit vegitables. Don't use any cream now. Stop junk food.
There are some herbal medicines are available for purification of blood and lower the pitta but it should be taken by consultation of ayurvedic doctor only.