We present the case of a 72-year-old man with a one-week history of a red rash on the palms of both hands. A 4mm punch biopsy revealed interstitial granulomatous inflammation within the dermis and a colloidal iron stain showed increased dermal acid mucin. Immunohistochemical staining for CD68 confirmed the presence of abundant histiocytes within the dermis. The clinical and pathological correlation was consistent with the diagnosis of interstitial granuloma annulare. Exclusive involvement of the palms is a rare presentation and serves as a reminder for practitioners to keep granuloma annulare in their differential diagnosis when observing palmar plaques.
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