Hi, it appears to be the utricaria, due to some allergy
external or internal, external from soap, face powder, clothes, wollen, etc. Internal may be due to food, I advise you to make a list of the things used and eat, daily, when you get more of itching. when ever you get more make a mark on it, and avoid do it for quite some time, also avoid the commonly allergic substances like sea foods, milk products, etc. Thank you.