Answer:
Clobetasol proprionate should not be used on or around the groin area or other, similar areas such as the armpits.
This is because clobetasol is a very strong steroid, and there is increased risk of severe (and minor) side-effects if too much of the medication is absorbed. The groin and armpits are two areas of the body where the medication is easily absorbed, so it's easy to get too much in your body if it's applied to those areas. There is also increased risk of damaging the skin in those areas, as well.