The causes of small blood spots on the body include senile hemangioma, B-cell lymphoma, angiokeratoma and so on. 1. Geriatric hemangioma: in case of geriatric hemangioma, at this time, irregular red rash is formed due to capillary proliferation caused by various factors, which leads to the phenomenon of long pinpoint blood spots on the body. 2. B-cell lymphoma: due to the abnormal proliferation of B lymphocytes, multiple red or purplish-red papules can appear after violating the skin. 3. Angiokeratoma: due to a variety of factors lead to the dermal papillary layer of capillary dilatation, epidermal keratinization is excessive, so the body appeared pinpoint small blood spots. The reason for the long pinpoint blood spots on the body is more, a variety of purpura dermatosis will have a similar performance, it is recommended that the phenomenon of long pinpoint blood spots on the body, please consult a doctor in a timely manner to clarify the cause of the disease, so as not to delay the condition.