The pinpoint size of the bleeding spots under the skin may be allergy, or spider nevus, allergic purpura, blood system diseases and other conditions, which need to be analyzed specifically. 1. Allergy: if the bleeding spots are discolored when pressed, it may be a symptom caused by allergy. When the patient comes into contact with substances that cause skin allergy, it may lead to the appearance of pinpoint bleeding spots under the skin. 2. Spider nevus: if the bleeding spot does not fade when pressed, it is considered to be a manifestation of spider nevus, which is mainly due to the patient’s liver function abnormality or impaired blood clotting function. 3. Anaphylactic purpura: If the bleeding spots are symmetrically distributed on both sides of the lower limbs, it is generally considered as anaphylactic purpura, which may be accompanied by abdominal pain. 4. Hematological diseases: when suffering from acute leukemia, primary immune thrombocytopenia, aplastic anemia, skin bleedings or purpura can also occur due to thrombocytopenia. Patients with subcutaneous hemorrhage need to identify the cause according to their own situation, under the guidance of physicians, choose the corresponding treatment, and follow the doctor’s instructions to use drugs.