There are many reasons for itchy hair roots, such as hair follicle infections, allergic reactions, parasitic infections and other reasons. 1. Hair follicle infection: for example, the hair follicle is infected by external bacteria or fungi, which will cause congestion and edema of the hair follicle, and the itchy hair follicle root phenomenon may occur. 2. Metabolic reactions: for example, contact dermatitis caused by allergic factors, drug rash, eczema caused by allergies, hives, etc., may also lead to itchy hair roots. 3. Parasites: for example, pubic lice, scabies, etc., biting the local skin can also cause itchy follicle root phenomenon. Itchy hair follicles may have other reasons, need to go to the hospital in time to check, clear cause and follow the doctor’s instructions for treatment.