What's good to use on keloid scars on face?

Not much. Topical silicone is about the only thing available. Coupled with a compression garment you might see some changes. Intralesional ((injected into the scar) is is usually very good. Steroids , calcium channel blockers and some anti-cancer drugs will get a good response. See a plastic surgeon in your area for an evaluation .
Stepwise to keloids. The approach to keloids is nearly the same no matter where they occur: pressure, silicone sheeting, steroid injections, posssible 5 fu injections, possible intralesional excision, possible radiation therapy as well emerging or investigational immunotherapy treatments.