As a dermatologist, I never recommend a natural loofah for showering. They aren’t great for exfoliating and they don’t dry well. That perpetually damp loofah sitting in the shower is home to microbes that can cause infection on your skin. Some of the happy pathogens (germs) that call your loofah “home” include pseudomonas aeruginosa (a sweet-ish smelling bacteria that loves damp places), staph aureus (a sour smelling bacteria that causes impetigo and other serious skin infections) and candida yeast.
The perfect world that loofah provides for germs – The loofah sits in a damp and humid shower where there is minimal air circulation for drying. The natural and porous cucumber fibers of your loofah look pretty because they are a matrix of nooks and crannies. Your loofah becomes even more porous as you squeeze and press the fibers against your skin, bending and breaking them into even more nooks and crannies. Add soap scum, dead skin cells and skin oils into the damp and dark nooks and crannies and that loofah is a banquet of nourishment for the microbial populous, which eat down the fibers to make – more nooks and crannies – it’s microbial heaven.
Even worse than rubbing that on your healthy and intact skin is using it before or after shaving! This is double trouble, because shaving causes micro-abrasions in your skin that are perfect new homes for microbes to move into and cause skin infection. Shaving can also mechanically irritate hair follicles and those microbes may just take up residence in the nice warm indentation of a pore to cause shaving folliculitis.
I’m not a loofah fan, but if you love your loofah so much that I have not persuaded you with that description of loofah microbial adventure, then at least lower the odds of getting a skin infection by discouraging microbes from taking up residence in your loofah: