Immunodeficiencies Quiz: Ace Your Exams

A 20-year-old woman presents to her primary care physician’s office for evaluation of a rash under her breasts. She first noticed the rash two days ago while bathing. The patient reports recurrent rashes of similar appearance affecting her face and limbs since the age of two. She was recently treated for oral thrush at a local clinic. Past medical history is significant for hypothyroidism managed with levothyroxine. Family history is significant for a brother who experienced similar cutaneous symptoms and died of fulminant hepatitis at the age of six. She does not use tobacco, alcohol, or illicit drugs. Vitals are within normal limits. Physical examination demonstrates red-brown, beefy, homogenous patches under the breasts and massive erythematous-desquamating dermatosis involving the face, limbs and nails. Genital examination shows multiple labial fissures. Intraepidermal injection of Candida antigens yields no reactogenicity. Which of the following is the most likely diagnosis?