A 28-year-old woman complains of weakness, dizziness, nosebleeds, and hemorrhages on her torso. The condition onset was 4 months ago. Objectively, her condition is of moderate severity. There are multicolored painless hemorrhages 1-2 cm in size on her back and abdomen. The peripheral lymph nodes are not enlarged. The liver is (-), the spleen is (+). Blood test shows the following: Hb - 120 g/L, erythrocytes - 3.4 × 10/L, color index 0.9, reticulocytes - 0.9%, serum iron - 15.01 mmol/l, leukocytes - 4.2 × 109/L, eosinophils - 2%, basophils - 0%, band neutrophils - 7%, segmented neutrophils - 40%, monocytes - 6%, lymphocytes 45%, platelets 47.1 × 10/L, ESR – 27 mm/hour. What is the most likely diagnosis in this case?