Granuloma Annulare of the Palms in a Patient on Ribociclib for Metastatic Breast Cancer.

Granuloma annulare (GA) is a benign inflammatory skin condition that most commonly presents on the dorsal surfaces of the hands and feet. The etiology of GA is unknown; however, it has been associated with multiple triggers, including malignancy and targeted cancer therapy drugs. This case report describes a 66-year-old female with metastatic breast cancer on ribociclib who presented with painful, erythematous papules on the palmar surfaces of the hands. Histopathology confirmed a diagnosis of GA, indicating a rare presentation of GA on the palms.