小儿紫癜·气不摄血证(infantile purpura with syndrome of failure of qi to keep blood)是指气虚不能统摄血液,血溢脉外,以发病缓慢,紫癜反复发作,病程较长,瘀斑、瘀点颜色淡紫,面色少华,神疲气短,食欲不振,头晕心悸,舌淡,苔薄,脉细无力为常见症的小儿紫癜证候。