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Epidermolysis bullosa simplex, Koebner type(EBS1B)

MedGen UID:
Concept ID:
Disease or Syndrome
Synonyms: EBS 2; Epidermolysis Bullosa Simplex, Other Generalized; Generalized EBS
Modes of inheritance:
Autosomal dominant inheritance
MedGen UID:
Concept ID:
Intellectual Product
Source: Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in heterozygotes. In the context of medical genetics, an autosomal dominant disorder is caused when a single copy of the mutant allele is present. Males and females are affected equally, and can both transmit the disorder with a risk of 50% for each child of inheriting the mutant allele.
Not genetically inherited
MedGen UID:
Concept ID:
Source: Orphanet
clinical entity without genetic inheritance.
Gene (location): KRT14 (17q21.2)
Monarch Initiative: MONDO:0007554
OMIM®: 131900
Orphanet: ORPHA79399

Disease characteristics

Excerpted from the GeneReview: Epidermolysis Bullosa Simplex
Epidermolysis bullosa simplex (EBS) is characterized by fragility of the skin (and mucosal epithelia in some instances) that results in non-scarring blisters and erosions caused by minor mechanical trauma. EBS is distinguished from other types of epidermolysis bullosa (EB) or non-EB skin fragility syndromes by the location of the blistering in relation to the dermal-epidermal junction. In EBS, blistering occurs within basal keratinocytes. The severity of blistering ranges from limited to hands and feet to widespread involvement. Additional features can include hyperkeratosis of the palms and soles (keratoderma), nail dystrophy, milia, and hyper- and/or hypopigmentation. Rare EBS subtypes have been associated with additional clinical features including pyloric atresia, muscular dystrophy, cardiomyopathy, and/or nephropathy. [from GeneReviews]
Jodi Y So  |  Joyce Teng   view full author information

Additional description

Generalized intermediate epidermolysis bullosa simplex-1B (EBS1B) is an autosomal dominant disorder of skin in which intraepidermal blistering occurs after minor mechanical trauma. Skin blistering is generalized, begins at birth, and is worsened by heat, humidity, and sweating. The tendency to blistering diminishes in adolescence, when it may become localized to hands and feet. Intermediate EBS has previously been known as the Koebner type (summary by Has et al., 2020). For a discussion of genetic heterogeneity of the subtypes of EBS, see EBS1A (131760). Reviews Fine et al. (1991) provided a revised classification of the subtypes of inherited epidermolysis bullosa based on clinical and laboratory criteria. Fine et al. (2008) reviewed phenotypic features and molecular bases of all epidermolysis bullosa subtypes, and recommended revisions in the classification system. Has et al. (2020) reviewed characteristic features and molecular bases of the subtypes of epidermolysis bullosa, and provided a consensus reclassification of disorders with skin fragility.  http://www.omim.org/entry/131900

Clinical features

From HPO
Palmoplantar keratosis
MedGen UID:
Concept ID:
Disease or Syndrome
Abnormal thickening of the skin localized to the palm of the hand and the sole of the foot.
Nail dystrophy
MedGen UID:
Concept ID:
Disease or Syndrome
Onychodystrophy (nail dystrophy) refers to nail changes apart from changes of the color (nail dyschromia) and involves partial or complete disruption of the various keratinous layers of the nail plate.
MedGen UID:
Concept ID:
Anatomical Abnormality
Presence of multiple small cysts containing keratin (skin protein) and presenting as tiny pearly-white bumps just under the surface of the skin.
Oral mucosal blisters
MedGen UID:
Concept ID:
Sign or Symptom
Blisters arising in the mouth.
Abnormal blistering of the skin
MedGen UID:
Concept ID:
The presence of one or more bullae on the skin, defined as fluid-filled blisters more than 5 mm in diameter with thin walls.
Suprabasal cleavage
MedGen UID:
Concept ID:
Cleavage within the suprabasal cell layer of the epidermis, which lies directly above the basal layer and is composed of five to ten layers of cells.

Professional guidelines


Arline Diana I, Tan EC, Gondokaryono SP, Koh MJ, Dwiyana RF, Rahardja JI, Yogya Y, Rafi'ee K, Suwarsa O
Australas J Dermatol 2023 Nov;64(4):e327-e332. Epub 2023 Jul 14 doi: 10.1111/ajd.14121. PMID: 37452458
Chen F, Wei R, Deng D, Zhang X, Cao Y, Pan C, Wang Y, Cao Q, Wang J, Zeng M, Huang L, Gu Y, Yao Z, Li M
J Eur Acad Dermatol Venereol 2023 Feb;37(2):411-419. Epub 2022 Nov 5 doi: 10.1111/jdv.18692. PMID: 36287101
Bachir Y, Daruich A, Marie C, Robert MP, Bremond-Gignac D
Drugs 2022 Aug;82(12):1277-1285. Epub 2022 Sep 8 doi: 10.1007/s40265-022-01770-8. PMID: 36074321

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