Ecthyma. Multiple, circular or oval ulcers covered by a hard, brown dried crust on the legs is typical. Upon healing, scarring may occur.

ECTHYMA

Ecthyma is an infection by group A beta hemolytic streptococcus, staphylococcus aureus or both. As with other streptococcal infections, acute glomerulonephritis may occur. This condition should be distinguished from ecthyma gangrenosum (skin infection by Pseudomonas) and ecthyma contagiosum (orf).

• It represents condition in which the inflammation caused by a neglected bacterial infection involves the entire epidermis.
• In developed countries ecthyma mainly affects children, whereas in undeveloped countries with poorer hygiene and nutrition, any age can be affected.

Clinical

The initial lesion is composed of one or more pustules or vesicles on an erythematous base. The lesion is soon covered by a crust, which can be thick and adherent. The margin can be indurated, raised and violaceous.

Untreated, lesions may enlarge slowly over weeks-months to a diameter of 2-3 cm, and then heal with scarring. Patients are usually otherwise well. Lesions can evolve from within sites of pre-existing trauma or boils, and are most commonly found on the buttocks, legs and feet.

RegionalDerm

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