If you experience frequent bouts, your doctor may prescribe an antiviral medication to treat cold sores
Some causes of the symptoms you mention, could be lip
licking, Vit.B2 deficiency, smoking, overexposure to sun and ill fitting dentures. In extreme cases, this could be due to bacterial or fungal skin infection.
You need to drink plenty of water daily – around 1.5 – 3 litres per day and eat a balanced diet.