Small red blood spots on the arm may be caused by allergic purpura, hemangioma, urticaria and other factors.
1. Anaphylactic purpura: If the patient is exposed to substances to which he or she is susceptible to allergy, it will increase the local vascular permeability and brittleness, thus triggering the symptoms of skin hemorrhage and leading to the appearance of small red blood spots on the arm.
2. Hemangioma: when there is a hemangioma, it will also lead to red blood spots on the arm, which is mainly due to the local vascular endothelial cell abnormal proliferation caused by the performance of erythema, or papules pressure does not fade.
3. Urticaria: When patients eat allergy-prone substances, will stimulate the body’s immune system, resulting in the body of small blood vessels appear expansion and permeability enhancement, which triggered inflammatory exudation, so that the arm appeared erythema, the symptom of the wind mass.
Red blood spots on the arm, there may be other reasons, you need to go to the hospital in time to improve the examination, clear the cause of the disease to give targeted treatment.