Diaper rash- cornstarch and vasaline?

Toni
My son had moderate diaper rash that I've been treating with destin for a few days. It just seems to be getting worse and the destin really upsets him going on. Has anyone tried cornstarch and vasaline? My mother in law swears by it. Ive also heard of cornstarch and destin. Anyone know anything about it? Thanks!