If a red spot appears on the wrist and does not fade when pressed, purpura is considered to be more likely. If the rash is purplish red, uniform in size, does not fade when pressed, has a history of upper respiratory tract infection before the onset, and is sometimes accompanied by swelling and discomfort in the wrist joints, consider allergic purpura. The allergic purpura needs to exclude platelet abnormalities or coagulation abnormalities. The actual fact is that you will be able to get a lot more than just a few of the most effective and most effective products. If that red spot appears on the wrist and fades after pressing, with obvious itching, consider it may be dermatitis and eczema caused by allergy to certain substances, then treat with topical glucocorticoid cream and avoid contact with allergic substances.