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(A) Clinical image of the skin lesion showing erythema with papules and nodules on the left upper arm and adjacent to the axillary sulcus. (B) HE staining (100× magnification) of a 3 mm biopsy of the left arm showing atypical cells in the dermis without connection with the epidermis. (C) Keratin staining (100× magnification) confirming a squamous cell origin.
