Red spots of leukemia, also known as purpura or hemorrhagic spots, can grow anywhere on the body, such as the upper or lower extremities, etc. If they appear in the “danger triangle”, they need to pay more attention. 1. The cause of leukemia purpura or bleeding spots may be triggered by thrombocytopenia, which may appear in the lower or upper limbs, or anywhere on the body, such as the face. 2. If the bleeding is in the area surrounding the mouth and nose, the “danger triangle”, and is accompanied by blood blisters on the oral mucosa or the tongue, it is important to pay attention to the fact that this is a more serious condition, and there is a risk of secondary serious infections. For patients diagnosed with leukemia, it is recommended to cooperate with doctors for treatment as soon as possible to avoid delays.