Blue Staining
Blue material on a slide is commonly due to solar elastosis, mucin or calcium. Some bacteria and fungii may also look blue as may deposits of foreign material. If there is extensive leukocytoclasis in vasculitis the debris in the dermis can certainly look blue! Rarely a fixation artefact with hematoxylin in the dermis can look blue.
Lots of Blue cells in the dermis are seen in Spiradenoma, Cylindroma, Merkel cell carcinoma, BCC, Trichoblastoma and Lymphomas particularly B cell.
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