Hi Thanks for your query.
Pimples occur mainly due to hormonal imbalances which causes an overproduction of oil and cells inside a skin follicle. They block the opening of the skin pore and cause the follicle under the skin to swell and become red. It usually starts in teenage, but most of the time lasts longer.
Next Steps
Laser sessions would definitely help acne faster and better.
Health Tips
Following healthfeeds should be helpful
"What Makes Your Skin Prone to Acne? Top 5 Causes of Acne" by Dr. Jolly Shah Kapadia - https://www.practo.com/healthfeed/what-makes-your-skin-prone-to-acne-top-5-causes-of-acne-14523/post
"Teen Acne: What Helps, What Hurts!" by Dr. Jolly Shah Kapadia - https://www.practo.com/healthfeed/teen-acne-what-helps-what-hurts-14525/post