Oral herpes, also known as 'cold sores' or blisters on the lips, is commonly seen after a fever or illness and is caused by Herpes Simplex Virus 1(HSV-I).HSV-I is often passed on by kissing and close body contact. It can affect the skin and mucous membranes, and can cause blisters. To avoid passing on oral herpes, avoid touching the sores and keep good personal hygiene. Treatment will reduce the severity of the virus, so seek medical care IMMEDIATELY if you begin showing symptoms.
Attribution: Straight Talk Foundation