When should I expect scarring on the armpit from laser burn go away? (Photo)

Hyperpigmentation from any type needs a combination approach of peels like cosmelan,  lasers like clear and brilliant and aerolase or laser genesis, radiofrequency like venus viva, and constant skin care and sun protection.  Bimontly facials with silk peel dermalinfusion is essential to hydrate, exfoliate and infuse vitamins and antioxidants into the skin.  Burns also may need vascular lasers and antioxidants like vitamin C.  I suggest a formal consultation with an expert in lasers and peels and burns. Best, Dr. Emer.

You should be seeing your doctor regularly for management.  Hopefully he/she is a cosmetic dermatologist familiar with lasers and their side effects.  This will  get better- but you will need more than ICE balm.