What causes itching on the forehead and scalp?

Itchy forehead and scalp may be caused by conditions such as allergic dermatitis, seborrheic dermatitis, psoriasis, and other reasons. Specific details are as follows:
　　1. Allergic Dermatitis
If patients use skincare products or cosmetics with strong irritants in daily life, it may lead to localized allergic dermatitis. Inflammatory stimulation can cause the aforementioned symptoms. Patients should visit a正规 hospital and, under a doctor's guidance, take medications such as loratadine tablets or cimetidine tablets for treatment.
　　2. Seborrheic Dermatitis
When patients are infected with fungi such as Malassezia, it can lead to excessive local sebum secretion. This condition commonly occurs on the forehead, especially around the eyebrows and nose. Excessive oil secretion may stimulate nerve endings, resulting in the symptoms described above. Patients may follow medical advice to apply topical treatments such as miconazole nitrate ointment or terbinafine hydrochloride gel.
　　3. Psoriasis
Itching on the forehead may be due to scalp diseases such as scalp psoriasis. Psoriasis lesions can extend beyond the hairline, causing red patches on the forehead. Patients may follow their doctor’s instructions to use medications such as compound fluticasone ointment or desonide cream.
　　In addition, itchy sensations may also result from irritation of nerve endings. It is recommended that patients maintain good hygiene habits in daily life, frequently change and wash close-fitting clothing, and avoid sharing personal items to prevent worsening of the condition. If symptoms occur, patients should seek prompt medical attention at a hospital.