Treatments for acne include: topical or oral antibiotics, hormonal treatments, topical or oral retinoids, and phototherapy. The scars caused by acne can be treated with a laser. You might want to visit a dermatologist to consult which treatment might be most useful for your skin.
The missing period might be a side effect from taking BPC for a longer period. It might take time for your menstrual cycle to recover to its former hormonal fluctuations.