How do you heal old scars?

Time, and others.: Time is often the best way to get rid of scars, as most will fade eventually. Lasers, surgical excision or rearrangement, steroid injections, etc are all ways to treat scars. You should ask your primary doctor who to go to for this.

Time: Scars mature and can continue to improve for up to a year. They are sun-sensitive and may become hyperpigmented with sun exposure. The best way to treat a scar depends on the scar. Options include silicone gel, silicone sheeting, use of filler (for spot or crater-like scars), laser therapy, hydroquinone, dermabrasion, or kenalog (triamcinolone) injection, or surgical scar revision. See your plastic surgeon.