We report herein the case of a 62-year-old woman who had been suffering from multiple myeloma for 4 years. The patient was started on subcutaneous injection of lenograstim, a recombinant granulocyte-colony-stimulating factor (G-CSF), for chemotherapyinduced neutropenia (leukocyte count: 760/μl; absolute neutrophil count (ANC): 661/μl). Despite the treatment, the ANC decreased to 12/μl on day 6. On day 12, she developed a reddish papule with mild tenderness on the right cheek, followed by the appearance of similar lesions on the face and extremities, without any apparent preceding skin lesions. She was referred to the dermatology division on day 20. Physical examination revealed discrete or grouped, light or bright red, hemispherical hard papules and nodules up to 8 mm in size on the face and extremities (Figure 1A-C). Some of the nodules were ulcerated. Purpura was not observed. At this point, the ANC was 888/μl. The immunoglobulin G level was 4688 mg/dl (normal: 800-1800 mg/dl) 15 days before the first lenograstim injection, and it remained high at 3787 mg/dl 10 days after the cessation of lenograstim. Anti-neutrophil cytoplasmic antibodies were not tested.Skin biopsy showed a dense neutrophilic infiltrate with few lymphocytes in the upper dermis accompanied by a large amount of nuclearThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.