KRT20 and tuberculosis: Dermoscopy often falls short in differentiating TB/TE from BCC due to their shared findings of arborizing vessels and gray ovoid nests and globules, thus necessitating histopathologic evaluation.[18] Immunohistochemical evaluation utilizing keratin 20 (CK20) and androgen receptor (AR) staining can help distinguish TB/TE from BCC.[18,22] CK20 stains Merkel cells in TB/TE, while AR positivity suggests BCC.