Itchy red bumps inside the hair may be seborrheic dermatitis, folliculitis, eczema and other diseases caused by the symptomatic drug treatment. 1. seborrheic dermatitis: itchy red bumps inside the hair may be caused by seborrheic dermatitis, the patient can follow the doctor’s instructions for external use of sulfur preparations, salicylic acid preparations, ketoconazole lotion and other antifungal drugs, or external use of dexamethasone and other glucocorticoid creams, but also oral antihistamines, such as cetirizine, loratadine and so on. 2. Folliculitis: itchy red bumps inside the hair may also be triggered by folliculitis. Patients can use antibiotic drugs such as mupirocin ointment under the guidance of the doctor. 3. Eczema: itchy red bumps inside the hair may also be caused by eczema. Patients can use glucocorticoid cream under the guidance of a doctor, such as hydrocortisone, etc., itching significant patients, but also oral antihistamines such as loratadine. Patients with itchy red bumps inside the hair are advised to go to the hospital in time, under the guidance of the doctor, symptomatic treatment.