Most of your cases belong to neurodermatitis, so you should actively treat them.
Guiding opinions:
Topical medication can be used, such as Fuzhiqing ointment, Fusong ointment, triamcinolone acetonide cream, oral cetirizine tablets and vitamin C tablets. Pay attention to avoid spicy food and local friction, and it will get better gradually. I wish you a speedy recovery!