Pyoderma gangrenosum

What it is

A rare inflammatory neutrophilic dermatosis characterized by painful cutaneous ulcerations with a violaceous and undermined border affecting the lower extremities; however, any hair-bearing area can be affected.

Key facts

Prevalence

1-9 / 1 000 000 (annual incidence)

Age of onset

Adolescent, Adult, Childhood, Elderly

Inheritance

Unknown

Classified as

Disease

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

Genes reported in subtypes

Orphanet records this gene on 4 more specific entries under this disorder, not on this entry itself:

A well-studied disease is usually split into subtypes, and the gene is curated on whichever one the evidence belongs to. Open a subtype to see which gene goes with it.

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Cross-references