hamartoma Becker nevus syndrome linear and whorled nevoid hypermelanosis https://rarediseases.info.nih.gov/diseases/11004/linear-and-whorled-nevoid-hypermelanosis https://www.malacards.org/card/nevoid_hypermelanosis_linear_and_whorled MONDO:0013688 zebra-like hyperpigmentation UMLS:C1304501 nevoid hypermelanosis, linear and whorled GARD:0011004 NCIT:C3924 hyperpigmentation, progressive cribriform and zosteriform reticulate hyperpigmentation of Iijima progressive cribriform and zosteriform hyperpigmentation Becker's Nevus zosteriform lentiginous nevus linear and whorled hypermelanosis SCTID:403803002 OMIM:614323 melanosis Neviformis linear papular ectodermal-mesodermal hamartoma pigmented hairy Nevus of Becker pigmented hairy Epidermal Nevus Orphanet:79150 MEDGEN:473394 Becker Nevus zosteriform hyperpigmentation LWNH Linear and whorled nevoid hypermelanosis (LWNH) is a rare skin condition characterized by swirling streaks of hyperpigmented (darkened) skin. The pigmentation follows the lines of Blashko and is mainly located on the trunk and limbs. It is present at birth or appears in the first few weeks of life. It typically progresses for one to two years and then stabilizes. Hyperpigmentation is usually the only symptom but there are isolated reports of other symptoms, involving mostly the central nervous system, musculoskeletal system, and heart. While most cases of LWNH are sporadic, apparent genetic transmission rarely has been described. A few people with LWNH have been diagnosed with chromosomal mosaicism. hyperpigmentation of the skin