Potatoes are made of starch and in most cases can be eaten by people with urticaria. However, allergens need to be tested to see if the patient is allergic to starchy foods, and if so, they need to stop eating them immediately and switch to other staple foods or vegetables. In addition, urticaria can be caused by allergic factors, the allergic substances are mostly due to foreign proteins, including eggs, milk, beef, lamb and other proteins, and allergies to starch are relatively rare. Therefore, if you do not have the condition of checking allergens, you can try to eat potatoes, that is, a small amount of potatoes, in order to test whether it causes urticaria or recurrence, and if not, you can boldly eat without fear.