Acne develops when sebum (an oily substance) that lubricates your hair and skin and dead skin cells plug hair follicles. Bacteria can trigger inflammation and infection resulting in more severe acne.
As the cause of acne is not single factorial, so treatment also requires multi factorial approach.

Peels to  balance oil and sebum
Extraction med clean up
Antibacterial therapy 
Microneedling for scars and marks and open pores