If a patient’s scalp is itchy and red, it means that seborrheic dermatitis may be present in the scalp area. The specific causes of seborrheic dermatitis are complex and may be related to improper lifestyle habits, such as staying up late or frequently using alkaline toiletries for washing, and repeated local scratching while washing, which may cause the inflammatory response to intensify and eventually form itchy and inflammatory manifestations. After the formation of seborrheic dermatitis, you need to actively carry out the appropriate treatment, anti-allergic and anti-inflammatory treatment, such as the topical application of Haxenaid solution, and oral antihistamines, such as Benadryl.