Although diaper rash, yeast infections, and ringworm are all caused by types of fungus, the medications used for those infections (nystatin) are not effective for ringworm.

What fungus does nystatin treat?

Nystatin cream treats a type of fungal infection called cutaneous candidiasis, which is caused by yeast. Yeast infections aren't contagious, but they can be uncomfortable. They are most commonly found in warm areas of the body that are creased and are regularly moist, such as the armpits or groin.

What cures ringworm fast?

Over-the-counter antifungals can kill the fungus and promote healing. Effective medications include miconazole (Cruex), clotrimazole (Desenex) and terbinafine (Lamisil). After cleaning the rash, apply a thin layer of antifungal medication to the affected area 2 to 3 times per day or as directed by the package.