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Histology of the keloid dermis at different depths. (A,B) In the SD, a heavy infiltrate of fibroblasts and lymphocytes was found, and collagen bundles were fine and organized parallel to each other. (A,B) In the MD, compact collagen bundles and abundant fibroblasts were found. (A,B) Atrophic and degenerate cells, as well as hyalinized collagen fibers were found in the DD. SD, superficial dermis; MD, middle dermis; DD, deep dermis. Scale bar = 100 μm.
