I am sorry to say that there is nothing that you can put on your skin to burn away fat. A lot of topical creams claim to burn fat, get rid of cellulite, etc. If anything makes that claim, check the ingredients to see if there is caffeine in it. Caffeine has been proven as a topical agent to temporarily improve the appearance of cellulite. I believe it works by dehydrating the area. If you apply a product with caffeine in it, you may notice a difference but if you stop using the product, then the area will go back to normal. I checked yohimburn and it contains caffeine and possibly other dehydrating ingredients.
I have also heard of using a caffeine compress made at home but I am personally too lazy to care about the appearance of any cellulite I may have