Woman 37 years old, chemist-technologist. Worried about the appearance of bruises on the abdomen, thighs, legs after minor injuries or without cause. During the examination, numerous bruises were found, which in places merge (from 1 × 1 to 4 × 5 cm). There are no other changes. Menstruation lasts up to 7 days. Spleen not palpable. In the blood found: Hb - 92 g/l, leukocytes - 7.2 × 109/l, platelets - 6 × 10 ^ g/l, erythrocyte sedimentation rate - 33 mm/h. What is the pathogenesis of this disease?