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The case of a 4-year-old boy with chronic mucocutaneous candidiasis is reported. Nail sections stained with periodic acid-Schiff and Grocott-Gomori methenamine-silver showed pseudohyphae running haphazardly within the nail. Scanning electron microscopy showed hyphae penetrating into the nail plate and the hair shaft.

Idiopathic hypoparathyroidism is a rare disorder produced by parathyroid hormone deficiency of unknown cause. It is often associated with other endocrine abnormalities. Patients with idiopathic hypoparathyroidism frequently develop ectodermal disease, including dry, rough skin: coarse, brittle hair; and lusterless, distally split nails. All of these complaints are relatively common in a dermatologic practice. Chronic mucocutaneous candidiasis is also a manifestation of idiopathic hypoparathyroidism. A patient is presented with a prominent ectodermal dysplasia and a chronic mucocutaneous candidiasis that were due to the underlying idiopathic hypoparathyroidism. A brief review of idiopathic hypoparathyroidism is included, as well as the implications of this diagnosis in terms of differential diagnosis, associated endocrine disorders, and therapy.