The reason why the back and forehead are always itchy is considered to be the following: 1. Malassezia folliculitis, mainly due to excessive secretion of sebaceous glands of hair follicles, causing malassezia infection of the skin and chronic inflammatory skin diseases, so in the treatment can be applied to the mixture of Econobetone cream and urea vitamin E cream for external use. 2. can be considered to be allergic skin diseases, such as eczema, mainly due to The actual skin is a chronic inflammatory allergic skin disease caused by environmental factors, drugs, and food. It is a fungal skin disease caused by the transmission of parasites from pets to humans. Therefore, in the treatment, you can apply bifenazole cream and tretinoin econazole cream mixed with topical application, while the pet at home needs to go to the vaccination station for injection treatment.4. Considered as scabies, mainly due to scabies mite caused by human infectious skin disease. In the treatment, you can apply sulfur ointment and dextran cream mixed with topical application, and also take oral moistening and anti-itching capsules and levocetirizine hydrochloride tablets. Therefore, for the forehead and back are always particularly itchy, it is necessary to go to a regular hospital, under the guidance of a dermatologist, to conduct the appropriate laboratory tests to determine the diagnosis and guide the clinical treatment.