Definition of Ecthyma:

Ecthyma is a skin infection similar to impetigo. It is often called "deep impetigo" because it occurs deep inside the skin.

Causes, incidence, and risk factors:

Ecthyma is most often caused by the bacteria streptococcus. Sometimes, staphylococcus bacteria causes this skin infection.

The infection may start in skin that has been injured due to a scratch or insect bite. It often develops on the legs.

The infection may first appear with a pus-filled blister, similar to that seen in persons with impetigo. However, the infection spreads much deeper into the skin.