There are many benefits and good reasons why we use sugar and coffee as a scrub, here's what battleeczema.com said:
benefits of using sugar
sugar contains moisturizing properties which doesn’t dry out your skin after scrubbing. it may be the reason why sugar is usually recommended for those with dry skin.
benefit of caffeine
coffee have caffeinated properties in reducing cellulite, improving circulation and tightening & smoothing out any puffy areas by constricting blood vessels. it is also high in antioxidant which can act as an anti-inflammatory ingredient, which is great because it doesn’t aggravate the skin at all.