immune thrombocytopenic purpura
noun [ U ] medical specialized uk/ɪˌmjuːn θrɒm.bəʊ.saɪ.təˌpen.ɪk ˈpɜː.pjʊə.rə/ us/ɪˈmjuːn ˌθrɑːm.boʊ.saɪ.t̬əˈpiː.nɪk ˈpɝː.pjɚ.ə/ (also idiopathic thrombocytopenic purpura)
免疫性血小板减少性紫癜，特发性血小板减少性紫癜
a condition in which the body does not have enough platelets (= very small cells in the blood that make it thicker in order to stop bleeding), often causing very small red spots to form on the skin