A case of untreated primary hypoparathyroidism with psoriasis vulgaris is reported. On systemic prednisone therapy the patient developed generalized erythroderma, pustular psoriasis of the soles, candidiasis of the mouth, dermatogenic enteropathy and manifest tetany. Correction of the serum calcium improved the severe skin lesions, emphasizing that fluctuations in serum calcixim affect psoriasis.Hypoparathyroidism may be associated with dermatological diseases as diverse as impetigo herpetifor-