Tinea nigra is a very rare fungal infection. It causes dark spots on the bottom of the feet, the palms of the hand, or, on rare occasions, the torso. These may be black or brown. A type of yeast ...

These pathogens have developed numerous mechanisms that allow them to adhere to the skin. Once there, the pathogens produce keratinases that break down keratin and allow for invasion of the fungi into ...