An instructive case of amlodipine-induced reversible granulomatous CD30⁺ T-cell pseudolymphoma

We report an unusual case of drug-associated granulomatous CD30⁺ T-cell pseudolymphoma secondary to amlodipine. A 55-year-old Chinese man presented with a 6-month eruption of disseminated erythematous dermal papulonodules and annular infiltrated plaques over his neck and limbs symmetrically. Histopathology revealed a perivascular and interstitial infiltrate of histiocytes, eosinophils and morphologically normal lymphocytes associated with CD30 expression. The eruption improved rapidly after discontinuation of amlodipine and did not recur.