Mega Babe makes some great products to address this and other weird body issues. You can also check out the gel-type stuff that runners use on their feet to prevent blisters and just use it on your thighs. In a pinch, regular deodorant will also work (but it works better if it’s a “powdery” kind and not a gel…does that make sense? Like the more solid ones?) but you will have to reapply. There are also all kinds of shorts you can wear under your clothes from bike shorts to shape wear to light and not tight shorts made for this problem (just google around), but whether or not those work will depend on what kind of clothes you’re wearing over it. A lot of feminine styles shorts are too short to cover those things but they’re great with longer shorts or dresses/skirts.