Is this normal for my belly on?

This might sound odd, but this is yahoo answers, and I cant ask anyone else, here it goes. I was laying on my bed talking on the phone, and I was playing with my belly on for no real reason. Anyway, after the conversation was over, I felt something waxy on my finger nail, I put it up to my nose and it smelled pretty bad. I spread open my belly on with my fingers, and theres some brown stuff inside. Does anyone have this in their belly on? Is it supposed to be like that. I never really looked inside.