Does Clobetasol Propionate 0.05% Cream have side effects if applied to your gums

My wife was perscribed Clobetasol Propionate for her gums by her Peridontist. She applies the USP 0.05% cream twice daily onto her gums and has done this regularly for the past 3 months Lately she has not been able to eat or eats very little at  at ALL meals. This morning after she applied the cream and had it was on for awhile I found her gaging at the kitchen sink. I believe it is this cream that is causing these side effects.

Please advise.

I need help.

Thank you