Candidiasis is a yeast infection, thrush, diaper rash or fungal infection. It's a condition that affects both men and women. Symptoms really depend on the state of the infection. It could include a light discharge from the vagina, whitish patches in the mouth or present on the tongue. Patients also experience cracking at corners of the mouth, pain when swallowing, skin rashes with scalloped edges, itching and burning in the genitals as well as thickened and discolored toenails or fingernails.