I've small scald burn 9 ds ago, 1st its erythematous and painful, i apply silver sulphadiazene, now top skin's rough, brown, a little wrinkled, doesn't peel?

Sounds like deep: First degree or superficial secondary thermal burn. In either case, burn is partial thickness, so your skin should heal with minimal if any scarring.

Healing: It sounds like you had a first degree verging second degree burn that is now healing. Do not peel it and as the deeper parts of skin continue to heal, that small area should start to slough off and it should be fine.