Kanchana LeerunyakulPoonkiat SuchonwanitFaculty of Medicine, Ramathibodi Hospital, Mahidol University2020-01-272020-01-272019-05-01Case Reports in Dermatology. Vol.11, No.2 (2019), 204-208166265672-s2.0-85068610268https://repository.li.mahidol.ac.th/handle/20.500.14594/51660© 2019 The Author(s). Published by S. Karger AG, Basel. Loose anagen hair syndrome is an uncommon hair disorder, particularly in non-Caucasian children. We report the case of a 13-year-old Thai boy who presented with a single patch of hair thinning on the frontal scalp with excessive shedding, and the hairs did not grow long. Microscopic examination showed naked anagen bulbs with ruffling of the cuticle, which is compatible with loose anagen hair syndrome. To our knowledge, there is no reported case in Southeast Asian children.Mahidol UniversityMedicineReviewSCOPUS10.1159/000501443