I have a rash under my belly and it has gotten worst me and wifehave sex her wetness make itnworst and it hasbspread all over my stomach what to do?

Could be fungal. You can try an antifungal cream such as Clotrimazole which we can buy at the dollar store. Use as directed. Do not wash it off. Let it stay on... For at least 12-15 hours before washing. Also.. Obviously test a little on some skin to make sure you are not allergic before applying a large amount on your skin.