The feeling of crawling insects on the face may be caused by allergic dermatitis, peripheral neuritis, cerebrovascular disease and other reasons. 1. Allergic dermatitis: allergic substances such as pollen can cause itchy skin, pimples and other symptoms, and when the face is allergic, there can be sensory abnormalities, which can be manifested as a feeling of crawling insects on the face. 2. Peripheral neuritis: it refers to the inflammatory lesion of single or multiple nerves triggered by various factors, which may cause sensory disorder, such as the damage of trigeminal nerve, which may lead to the feeling of crawling insects on the face. 3. Cerebrovascular disease: when cerebral infarction or cerebral hemorrhage occurs, the brain tissue and nerve conduction bundles are ischemic, hypoxic and necrotic, and the corresponding clinical symptoms may appear, and the face may have sensory abnormality, such as insect crawling sensation, etc. The patient may also have dizziness, headache and fever. Patients may also have dizziness, headache, abnormal sensation in limbs, limb movement disorder and other symptoms. Insect crawling sensation on the face may also be seen in other diseases such as eczema. If the feeling of crawling insects on the face occurs and continues without relief, timely medical treatment is needed.