The swollen face and crooked mouth may be idiopathic facial nerve palsy, also known as facial neuritis, which is a kind of facial nerve demyelination change caused by viral infection or cold, and the patient may have crooked mouth and incomplete eye closure, as well as loss of frontal lines, shallow nasolabial folds, and loss of taste sensation in the first 2/3 of the tongue. Patients may also experience facial swelling, mainly due to neurotropism, and some patients may also experience pain in the eardrum before the disease. Patients with gingivitis or ear infections may also develop facial swelling. If the lesion invades the facial nerve, the mouth may also appear crooked, etc.