A day without washing your hair itchy may be related to oil secretion, seborrheic dermatitis, scalp folliculitis 1. Excessive oil secretion: due to hypersecretion of scalp oil glands will lead to excessive scalp oil secretion, resulting in an imbalance in the scalp flora environment, harmful bacteria began to grow, and then appeared a day without washing the head itchy phenomenon, you can choose to control the oil of the toiletries to alleviate the symptoms. 2. Seborrheic dermatitis: mainly associated with infection with Malassezia, may also be combined with bacterial infections, such as Staphylococcus aureus, so the scalp may appear after the infection of one day does not wash the head on the itchy situation. Treatment can choose to apply antibiotics, such as tetracycline or erythromycin, or oral B vitamins, such as vitamin B2, vitamin B6, etc. for treatment. 3. scalp folliculitis: various reasons lead to local skin barrier function damage, may lead to pathogen invasion to the hair follicle and hair follicle deep tissue, triggering folliculitis, and then appear scalp slight pain or a day without washing the head itchy situation, you can choose to external neomycin ointment, erythromycin ointment, such as bactericidal antipruritic drugs coated with the affected area. There are many other causes of itching without washing your hair for a day (such as ringworm), you should go to the hospital in time, under the guidance of a doctor to diagnose and treat, do not blindly use medication, so as not to cause adverse consequences.