Lelis syndrome

Lelis syndrome is an extremely rare genetic disorder characterized by the association of ectodermal dysplasia with localized hypopigmentation of the skin. The condition was first described by Lelis in 1980 in a Brazilian family. Key features include anhidrotic or hypohidrotic ectodermal dysplasia — which affects structures derived from the ectoderm such as hair, teeth, nails, and sweat glands — combined with areas of achromic (depigmented) skin patches. Patients typically present with sparse hair (hypotrichosis), abnormal or missing teeth (hypodontia or anodontia), reduced ability to sweat (hypohidrosis), and well-demarcated hypopigmented macules or patches on the skin. The ICD-10 classification places this condition under Q82.4, reflecting its ectodermal dysplasia component. The syndrome affects multiple body systems, primarily the integumentary system (skin, hair, nails, and sweat glands) and the dental system. The hypopigmented skin lesions distinguish Lelis syndrome from other forms of ectodermal dysplasia. Some reported cases have also described additional features, though the clinical spectrum remains incompletely defined due to the very small number of cases in the medical literature. There is currently no cure for Lelis syndrome. Treatment is symptomatic and supportive, focusing on management of ectodermal dysplasia manifestations such as dental prosthetics for missing teeth, avoidance of overheating due to impaired sweating, skin protection, and dermatologic monitoring of hypopigmented areas. Genetic counseling is recommended for affected families.

Common questions about Lelis syndrome