Diaper Rash

This may not be the appropriate section of the forum but I'll throw it out here .My Mistress wants me to develop a diaper rash as punishment. Stewing in a messy diaper is, unfortunately, not an option. A day wearing a wet cloth diaper has had no results. I have read of mustard powder, mothballs, even bleach used as punishments for wetting pants/diapers.. She wants me to suffer a rash but does NOT wish to cause permanent damage. Any suggestions will be welcome

Considering a diaper rash isn't a rash ,in fact it's the mildest form of burn known to man from ling exposure to acids , urine has a bunch ,feces gas a bunch and combined they make stronger more potent acids when mixed in a diaper .

So my thinking is mildest acid known to man is vinegar whether whute,apple differ, sherru,rice wine ,balsamic ( please don't waste a good ten year old balsamic ,get the cheap 2 year old stuff) get an old pair of cotton underwear soak them in vinegar put them on wrap diaper area in saran wrap you can add a guard or pad to absorb urine and wear until your uncomfortable due to rash or pad needs changed ,then seal yourself back up and wait . Short of spending some quality time in a wet loaded diaper this would be my best guess ,if that doesnt do it i would try saturating diaper area with vinegar and then applying a rasg cream , the idea being what they warn you not to do,on every rash cream which is seal the wetness/mess into skun instead of out away from skin .