Allergic purpura how to check allergens

Allergic purpura is mainly a small blood vessel allergic reaction caused by a class of self-limited acute bleeding disease. The cause may be infection, drug action, allergy, etc., some patients may be caused by pollen allergy. For such patients, it is recommended to check the allergen after the disease is relatively stable to prevent stimulation in the acute phase, so that symptoms worsen, sometimes it may show false positive. For infection caused, check the allergen is of little significance.