Erythema annulare centrifugum (EAC) is a slow progressing and recurring skin disease with unknown etiology, characterized by ring shaped erythematous skin rashes. EAC was first described by Darier in 1916, and classified in 1978 by Ackerman into a superficial and a deep type [1]. EAC has been associated with many different entities, including infections, food allergy and drug reactions, polycythemia vera, cryoglobulinaemia, myelodysplastic syndrome, hypereosinophilic syndrome, hyperthyroidism, autoimmune thyroidities, hepatic diseases, pregnancy and malignant neoplasms [2]. Relapsing polychondritis (RP) is a disease which progresses with inflammatory attacks on articular and non-articular cartilaginous tissue and is most commonly encountered as auricular chondritis. In auricular chondritis, that the earlobe is not affected and existence of one or two sided fulminant rubescence, sensitivity and oedema on external ear cartilaginous tissue are salient [3]. We report a case, who was diagnosed with acute myeloblastic leukemia (AML) two months after EAC was detected. Bilateral auricular chondritis developed in the third day of her chemotherapy and EAC lesions relapsed during the course of chemotherapy.A 53 year old female patient with complaints of a sore throat was assessed in otorhinolaryngology polyclinic.While diagnosed with tonsillitis and her antibiotherapy arranged, she was redirected to us upon detection of anemia, moderate thrombocytopenia and leukocytosis (hemoglobin 11.2 g/dL, hematocrit 33%, mean corpuscular volume 91 fL, white blood cell 19.2 x 10 9 /L, neutrophile 0.9 x 10 9 /L, thrombocyte 120 x 10 9 /L). In her physical examination no symptom was found except cryptic tonsillitis. She did not have a known systemic disease nor she did regularly use a medication. Her liver, kidney and thyroid functions tests were normal. In her bone marrow biopsy, conducted upon monitoring of blastic cell with a rate of 90% during her peripheral smear, diffuse blastic cell infiltration was found. In bone marrow aspiration, usually large, potential undifferentiated blasts with heterogenous structure and agranular cytoplasm, but not involving Auer rods, were detected. After immunohistochemical examination the patient was diagnosed with AML M0, and classic 7+3 induction chemotherapy regimen involving cytosine arabinoside and idarubicin combination protocol was initiated. On the third day of treatment palpable rash on her abdominal skin (Figure 1), and swelling, rubescence and sensitivity on both ears that do not prominently effect the earlobe (Figure 2a -2b) occurred. A biopsy from the lesions on the abdominal skin was performed. Lesions on the ear auricle of the patient were assessed as