Clinically it presents as a superficial or deep loss of substance, circumscript, surrounded by an erythematous, inflammatory zone, slightly elevated.  The background is a greyish white color due to superficial tissue necrosis.   It has an elastic consistency, rubbery and edematous.   They are painful, especially when they present in the tongue, and are always related to dental or prosthetic traumatisms.  As a mechanical or physical lesion of the oral mucosa they acquire great importance not only due to their elevated frequency of occurence, but also because statistically, when they do not cure or receed, they enter in the group of lesions which are statistically precancerous.

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