If the redness is caused by strenuous exercise, temperature changes or mood swings, it can be relieved by resting, adding or removing clothes and regulating emotions; if it is caused by skin allergies, avoid allergens; if it is caused by dry skin, use moisturising products such as petroleum jelly and moisturiser to keep the skin moist. If the cause is not clear, you should seek medical attention so that a clear diagnosis can be made and the right treatment can be given.