When my little ones get a diaper rash....i have learned over experience the beat way to treat it.
clean the area with wipe, then apply Tucks pad, gently rub the pad on the effected area using a dabbing like motion.
sometimes i leave it on the area for a minute or two. then apply diaper rash cream.
My daughter had a horrible rash from being sick and i applied this one time, the next time i changed her diaper it was almost all gone!!!!