What's the best way to treat a 2nd degree burn mark? also how can i remove the scar after it's healed?

Promote healing: The best way is to protect the wound to speed up healing i.e. Leave the blister intact unless it is so large it is a problem. Then a doctor should debride it and provide a sterile dressing and antibiotic cream. Keep the mark out of direct sunlight and don't smoke as it slows healing. You can also purchase silicone gel/ sheeting as that can speed fading. See a plastic surgeon for further help.