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Focal facial dermal dysplasia type III (FFDD3) is a rare focal facial facial dysplasia (FFDD), characterized primarily by congenital bitemporal scar-like depressions and a typical, but variable facial dysmorphism, which may include distichiasis (upper lids) or lacking eyelashes, slanted eyebrows and a flattened and/or bulbous nasal tip and other features such as a low frontal hairline, sparse hair, redundant skin, epicanthal folds, low-set dysplastic ears, blepharitis and conjunctivitis.
Features include always present findings: Bitemporal forceps marks and Periorbital fullness; and very common findings: Low anterior hairline, Depressed nasal bridge, Bulbous nose, and Distichiasis and others. 13 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 1 | Depressed nasal bridge |
TWIST2 function has not been fully characterized.
Focal facial dermal dysplasia type III is associated with mutations in the TWIST2 gene on chromosome 2.
Genetic testing for TWIST2 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 2 always present features, 5 very common features, 3 common features.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for focal facial dermal dysplasia type III.
1 publication has been identified in PubMed for focal facial dermal dysplasia type III. Research spans Case Report / Case Series (100%).
Gnesotto L (2025). [PMID: 40231353](https://pubmed.ncbi.nlm.nih.gov/40231353/). *Dermatology reports*. [Case Report / Case Series]
Data assembled from 6 of 12 sources · Last updated Sep 19, 2026, 9:09 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Head and neck
1 |
Thick upper lip vermilion |
Age of onset: at birth.