Fever blisters, also called cold sores, are caused by the herpes simplex virus, type 1. The blisters can occur on your lips, cheeks, chin, gums or nostrils. You might experience a tingling sensation one to two days before the initial fever blister outbreak of fluid-filled blisters around your mouth.

Fever blisters, also known as cold sores, are clusters of small, itchy or painful blisters and sores that usually develop on or around the mouth.

Sores that develop on your tongue after eating chocolate are most likely related to an allergic reaction. Canker sores are the most common type of sores that can form from a chocolate allergy. Other common allergic rashes include hives and atopic dermatitis.

Fever blisters, or cold sores, are mouth lesions caused by the herpes simplex virus. Once your lesion heals, your lip may remain swollen due to the infection and irritation that was present. This may still cause discomfort, even after the cold sore blisters are completely gone.

Here it comes again -- that tingling feeling in your lip signaling the beginning of yet another cold sore. Unfortunately, there is no quick cure and once a cold sore begins, it usually has to run its course.

Muscle tension in your neck can make your day unbearable. A tight muscle in the neck can occur by twisting your neck, exercising too vigorously, sleeping with your neck in an uncomfortable position or slouching while you work or watch TV.

Cold sores are red bumps that eventually become open wounds on the outer lip area and sometimes the cheek or inside the nose. The American Academy of Dermatology says that the herpes simplex virus type one is the most likely cause of cold sores, sometimes called fever blisters.

Cold sores result from infection with one of two types of the herpes simplex virus, usually type one. There is no cure for herpes, so people who contract the virus carry it for life, according to National Institutes of Health dermatologists Stephen E. Straus and Adriana R.

Some lumps and bumps are easy to hide under clothing -- but not so when you develop an unsightly bump on your lip. A bump at the corner of your lips is most often due to something simple, such as a cold sore or chapped lips. But there are other possibilities, too, including skin cancer.

Fever blisters, also known as cold sores, are caused by the herpes simplex 1 virus. The virus lies dormant in your body and is usually kept in check by your immune system until something, such as an illness or stress, weakens your system and triggers an outbreak.

Cold sores are caused by herpes simplex I virus and usually form on the lips. They can, however, also form on the nose. According to Medline Plus, the virus is highly contagious, and more than half the U.S. population is exposed by the age of 20. Cold sores can last a week or longer, and there is currently no cure.

Running is a proven way for you to reduce or maintain your body weight, lower your stress levels, boost your cardiovascular fitness and even enhance your social life. As with all forms of vigorous exercise, however, occasional soreness and injury are virtually inevitable.