Rare diseases · Sign or symptom
Hydroa vacciniforme
HP:0032381
What it means
In response to the spring sun distinct inflamed reddened skin develops on the ears, nose, cheeks, fingers, backs of the hands, and the lower arms, on which blisters with serous or hemorrhagic content develop. These dry out with the formation of a blackish scab. After shedding of the scab, depressed, varioliform, often hypopigmented scars remain. In addition, hyper- and hypopigmentation are present together, resulting in a polymorphous skin presentation.
Rare diseases that can present with this1
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Acute vesiculation and crusting and scarring following sun exposure
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.