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Related to tangential excision: skin grafting
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Thus, following application, blue colour indicates non-viable tissue and conversely nonblue staining indicates viable tissue--thereby facilitating tangential excision.
If that doesn't work, we do a procedure called a tangential excision, where layer after layer of tissue is shaved away until we reach a wound bed that shows viability.
Usually, however, I do a tangential excision and remove the epidermal growth and a small bit of dermis.