NCIthesaurus cutaneous diphtheria ICD10CM:A36.3 DOID:12275 A pyoderma that is a milder form of diphtheria restricted to the skin producing shallow skin ulcers is caused by direct physical contact of indivduals infected with Corynebacterium diphtheriae as the bacteria releases the diphtheria toxin. NCI:C34544 UMLS_CUI:C0012555 SNOMEDCT_US_2025_09_01:18901009 disease_ontology ICD9CM:032.85 pyoderma