Fig 1.
Patient selection diagram.
Table 1.
Clinical features of 17 Korean men with acne keloidalis nuchae.
Fig 2.
Clinical features of acne keloidalis nuchae (AKN) in 17 Korean patients.
Follicular papules progressed to keloidal plaques with loss of hair. (a) 20-year-old man developed a lesion 3 months ago. (b) 26-year-old man developed a lesion 2 years ago. (c) 54-year-old man developed a lesion 13 years ago.
Fig 3.
Histological features of acne keloidalis nuchae (AKN) in 17 Korean patients.
Excised AKN specimen stained with hematoxylin and eosin. (a) Low-power view of specimen showing ruptured hair follicle in the mid-third portion of the dermis and irregularly arranged compact collagen bundles (magnification, 40×). (b) Some naked hair shafts and remaining follicular epithelium admixed with acute and chronic inflammatory cells (magnification, 100×). (c) Perifollicular region infiltrated by neutrophils, histiocytes, lymphocytes, eosinophils, and plasma cells (magnification, 200×). (d) Compact collagen bundles and dilated vasculature with lymphoplasmacytic infiltrate (magnification, 200×).