We examined seven patients with lichen planus pigmentosus (LPP) clinically and
microscopically. Clinically, all patients had a striking predominance of lesions in an …

Blue naevi (BN) form a wide group of benign dermal melanocytic proliferations. They are
genetically distinct from common and Spitz naevi with frequent hotspot mutations occurring …

Background: Agmination and/or satellitosis in pigmented blue lesions is a phenomenon
rarely mentioned in the literature and not well known. This phenomenon can be expressed …

Background The conventionally understood pathogenesis of agminated Spitz nevi includes
a mosaic HRAS mutation followed by copy number gains in 11p. However, we have recently …

Several tumors, including uveal melanoma, show somatic mutations of GNAQ/GNA11.
Circumscribed choroidal hemangioma is a benign tumor that becomes symptomatic in …

Vascular malformations include various disorders characterized by morphological, structural
and/or functional alterations of blood and lymph vessels. Most are sporadic, due to somatic …

Background Next‐generation sequencing has greatly increased our understanding of
vascular birthmarks. Many port‐wine birthmarks are due to somatic mutations in …

Blue nevi, usually presenting as solitary, bluish, asymptomatic macules or nodules, are
formed by collections of dermal melanocytes that failed to complete their migration from the …

Pigmented papular lesions can have varied differentials, especially in skin of colour,
including seborrheic keratosis, melanocytic naevus, dermatofibroma, leiomyoma, pigmented …

Discussion The authors identified 68 case reports of PTBN at the National Library of
Medicine, with 17 patients showing lesions extending to deep tissues, of which 4 …