Colony-stimulating factors are widely used for bone marrow recovery after chemotherapy. Various cutaneous side-effects have been described in most cases involving neutrophils. We report the first case of lichenoid reaction at injection sites of granulocyte colony-stimulating factor (G-CSF) in a 40-year-old patient treated for breast cancer. The eruption cleared after drug withdrawal, no recurrence was observed after drug replacement by granulocyte-macrophage colony-stimulating factor. Mainly lymphocyte-mediated lichenoid eruption to G-CSF was shown. Cutaneous side-effects to G-CSF do not share unequivocal pathogeny based on stimulation of neutrophils.
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