What is a good otc cure for keloids?

Really none.: If you have a true keloid scar the best first line treatment is steroid injection. If that fails to improve the keloid to your satisfaction the next option is excision which comes with very high recurrence rates (and can come back worse than the original) and a postop regimen of silicone, pressure, and in severe cases even radiation treatment. See a plastic surgeon or dermatologist.