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El síntoma principal del ectima es una pequeña ampolla con un borde enrojecido que puede estar llena de pus. La ampolla es similar a la que se observa en personas con impétigo, pero la infección se disemina mucho más profundo dentro de la piel.
Después de que la ampolla desaparece, aparece una úlcera con costra.
El médico generalmente puede diagnosticar esta afección simplemente observando la piel. En casos poco comunes, el líquido que se encuentra dentro de la ampolla se puede enviar a un laboratorio para un análisis minucioso o se puede hacer una biopsia de piel.
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