Candida yeasts usually reside in the mouth, digestive tract or vagina, but it can overgrow on or inside the body to develop into an infection. Sometimes people taking antibiotics for a bacterial infection may develop candidiasis, because the medication can kill off bacteria that usually keep candida from overgrowing [source: Merck].
Moist areas on the body, such as armpits, in between toes, under women's breasts, the anus and the groin are all susceptible to candidiasis. Unlike with jock itch, candida infections often spread to the penis itself -- more commonly in men who are uncircumcised. Obesity is also a contributing factor for candida skin infections, because body folds provide more hospitable areas for the fungus to grow. Incidentally, aside from exterior skin, candida can also infect the lining of the mouth or vagina (commonly referred to simply as a yeast infection).
Several different species of candida yeast can cause these infections, and they may look different depending on where they are on the body. They often result in reddish, rashes with pustular bumps and lesions. Not surprisingly, on the feet, it can resemble athlete's foot. The affected skin will also likely scale and fissure.
As with dermatophyte infections, you can fight candidiasis with anti-fungal creams. If over-the-counter topical agents don't work, seek out a doctor, who might prescribe something stronger.