Hello, You may have an oral fungal infection. Try some acidophilus and continue to avoid acidic and spicy foods. Rinse your mouth with warm salt water to soothe and cleanse. If you do not get relief or feel your condition is worse, see your dentist for an evaluation. A prescription anti fungal medication, Nystatin, may be required to treat a yeast infection. Other possibilities include viral infections will take time to heal. You should continue to avoid all irritants including smoking and alcohol. Consider your sleeping habits and congestion causing you to breath through your mouth. Any sinus concerns? This can dry out you palate and cause dry lips. Keep well hydrated. Any recent food changes? An allergic response could be responsible for this condition. Antihistamines can offer relief. Itching can be treated with Benadryl. I hope that my suggestions are helpful. Thank you for your inquiry.