Localized Longitudinal Erythronychia

Dermoscopy of Onychopapilloma: A Benign Mimic of Subungual Malignancy

“…However, multiple nails are affected and classically have alternating red and white stripes, referred to as “candy-cane nails” [ 11 ]. Nail bed lichen planus may initially present with longitudinal erythronychia of a single nail but can be distinguished from onychopapilloma with onychorrhexis and nail plate atrophy [ 7 , 12 ].…”

Polydactylous Transverse Erythronychia: Report of a Patient with Multiple Horizontal Red Bands Affecting the Fingernails

“…There is no distinct gender predilection. It occurs most frequently among middle-aged individuals [11], but has also been reported in patients ranging in age from 18 to 87 years [11–13]. …”

“…It has been hypothesized that discoloration affecting the subungual tissues of the toes is less likely to be visualized due to the thickness of the toenails. Alternatively, it is possible that individuals are seldom aware of changes in toenail color and thus erythronychia of the toenails is simply underdiagnosed [11, 15]. …”

“…Although longitudinal erythronychia is often idiopathic, it has also been associated with benign subungual tumors, malignant subungual tumors, and various cutaneous conditions and systemic diseases (Table 2) [1–4, 6–8, 11–13, 16–43]. …”

“…Monodactylous longitudinal erythronychia, when characterized by a single linear red band on a single nail, is most often reported in individuals with benign subungual tumors such as glomus tumor [1, 2, 11, 12, 18, 19], onychopapilloma [2, 11, 12, 19, 20], and warty dyskeratoma [1, 12, 19, 21, 22]. Rarely, it has been associated with malignant subungual tumors, including squamous cell carcinoma and malignant melanoma [2, 6, 8, 11–13, 17–25].…”