The redness of the face by the caterpillar’s hair belongs to contact dermatitis, which can be dealt with by general treatment, local medication, systemic medication and other measures. 1. General treatment: first of all, avoid contact with the caterpillar again, rinse with water, avoid scratching, squeezing, you can use a cool towel, ice for cold compresses, can relieve the symptoms. 2. Topical medication: you can use hydrocortisone butyrate cream, Dinaid cream and other medications, with anti-itching and anti-inflammatory, anti-allergic effect. 3. Systemic medication: If the symptoms cannot be relieved after taking the above measures, antihistamines such as chlorpheniramine maleate and cetirizine can be taken for treatment. It is recommended to go to the hospital for examination and treatment as prescribed by the doctor.