Scientists are urging those who use loofah's to throw them away ASAP.
The puff could be doing more harm that good. Dermatologists say that exfoliating and removing those dead skin cells is good, but those dead skin cells get trapped in all the layers of the puff which creates a breeding ground for bacteria.
Then, on top of all that... your damp loofah sitting in the moist air in your bathroom just causes all the bacteria to fester inside of the puff which could lead to mold and yeast.
If you'd like to keep your beloved loofah, just take precaution and make sure to rinse it thoroughly and keep it away from the shower so that you make sure it's completely dry. You should also replace it at lease once a month.
Read more about loofah safety HERE.