Legs old itchy scratching old scabs have been bad according to the cause of the symptomatic treatment, usually using medication, common causes include eczema, neurodermatitis and so on. 1. Eczema: local topical glucocorticoid ointment, such as hydrocortisone cream, mometasone furoate cream, etc.; if there is a large amount of exudate, can be used externally with boric acid solution for cold wet compress. 2. Neurodermatitis: local topical halometasone cream, tacrolimus ointment, etc.; if the hypertrophic mossification is serious, glucocorticoids such as tretinoin injection can be used for local injection; if the itching symptom is serious, antihistamine drugs can be taken orally at the same time, such as Cetirizine Hydrochloride tablets. All of the above drugs need to be used under the guidance of a professional doctor to avoid self-medication. Legs old itchy scratch old scabs have been bad may also be other causes, it is recommended to go to the hospital in a timely manner to improve the examination, clear cause of the disease to give targeted treatment.