A red patch on the roof of the mouth can be caused by colds, hand, foot and mouth disease, herpes stomatitis, etc. You should consult a doctor in time to clarify the cause of the disease and then treat it. 1. Colds: Colds caused by viral infections and other factors can cause a red patch on the palate of the mouth, and people suffering from this disease will also have symptoms such as runny nose, sore throat, cough, etc. They should pay attention to rest and drink more hot water. 2. Hand, foot and mouth disease: enterovirus-induced fever and rash disease, which can cause a red patch on the palate of the mouth, hands, feet, buttocks rash and fever and other symptoms, the patient should pay attention to rest, drink plenty of fluids, and use ribavirin for treatment when necessary. 3. Herpetic stomatitis: Stomatitis caused by herpes virus infection can also cause redness of the palate, small blisters in the mouth, fever, swollen lymph nodes and other symptoms, and such people should pay attention to rest, and use acyclovir and other treatment when necessary. All of the above medications should be used under a doctor’s supervision.