Why do my hands always feel like they have goop on them?

I've had this tic since I was a child, where I constantly feel like I have something on my hands. It usually feels like a slime or just anything I can never get off, no matter how many times I try to wipe it off. I do not have any health conditions, and I don't wash my hands obsessively to get this feeling to go away. It just feels like I always have something on my hands, and that thing is a goo. I tend to rub my hands together a lot in an attempt to 'get rid of' this invisible stuff, but no matter how hard I try, It never goes away.