Ecthyma Workup

Updated: Mar 08, 2019
  • Author: Loretta S Davis, MD; Chief Editor: William D James, MD  more...
  • Print

Laboratory Studies

Gram stain and culture of ecthyma lesions reveal gram-positive cocci that represent group A streptococci, with or without Staphylococcus aureus. Prior group A streptococci infection can be detected by anti-DNase beta testing.


Histologic Findings

Ecthyma lesions show dermal necrosis and inflammation. A deep and superficial granulomatous perivascular infiltrate occurs along with endothelial edema. A heavy crust covers the surface of the ecthyma ulcer.