Candidiasis (Yeast Infection, Candida): Candidiasis is type of yeast infection, and is the most common type of yeast infection. Areas where candidiasis yeast infection can occur are vaginal, thrush (mouth), skin, diaper rash, nailbed, and penile and other genital organs. Treatment for candidiasis yeast infections are OTC and prescription medication. Rarely a candidiasis yeast infection can infect the internal organs and cause serious complications, even death.