Is that true, Sherina's lips hurt after kissing? NO, she said she got "Oral Ulceration". According to doctor, Oral Ulceration is characterised by a loss of the mucosal layer within the mouth. This loss may be acute or chronic, localised or diffuse. This is probably the most common oral problem presenting in the primary care setting and can arise as a result of a number of disorders. Some of these relate to problems around the oropharynx but a blinkered approach to history and examination of the patient runs the risk of missing the wide variety of systemic disorders that can also give rise to these lesions. SO, Sherina... you have to see a doctor!