A case of Hailey-Hailey disease accompanied by Cushing's syndrome and adrenal insufficiency due to long-term usage of topical steroids with review of literature.

Hailey-Hailey disease (HHD), or familial benign chronic pemphigus, is a rare autosomal dominant disorder characterized by recurrent vesicles and erosions in intertriginous areas. Topical corticosteroids are the primary treatment, but their potential systemic side effects are often overlooked. Prolonged use on compromised skin can lead to excessive absorption, increasing the risk of iatrogenic Cushing's syndrome and adrenal insufficiency. Here, we report the case of a 50-year-old woman with HHD who had been using topical clobetasol or betamethasone for over 10 years, reaching doses up to 50 g/day. She developed Cushingoid features, metabolic abnormalities, and suppression of the hypothalamic-pituitary-adrenal (HPA) axis. After tapering off topical corticosteroids, she developed adrenal insufficiency and associated withdrawal symptoms. Following the initiation of hydrocortisone replacement therapy, psychiatric symptoms, impaired glucose tolerance, and osteoporotic fractures emerged, suggesting exacerbation of iatrogenic Cushing's syndrome. This case highlights the risk of systemic complications from chronic topical corticosteroid use, particularly in high-absorption areas. Gradual dose reduction, close endocrine monitoring, and individualized tapering strategies are essential to prevent severe outcomes. Clinicians should be aware of potential adrenal suppression and consider endocrine evaluation in patients receiving prolonged, high-dose topical corticosteroid therapy.