Oral Herpes: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Oral Herpes?
A primary care doctor can often diagnose oral herpes by looking at your mouth. A dermatologist (a skin doctor) or an infectious disease doctor (a doctor who treats infections) may help if sores are severe or keep coming back. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is oral herpes?
Oral herpes is an infection of the lips, mouth, or gums due to the herpes simplex virus. It causes small, painful blisters commonly called cold sores or fever blisters.
Cold sores usually occur outside the mouth, on or around the lips. When they are inside the mouth, they are usually on the gums or the roof of the mouth. They are not the same as canker sores, which are not contagious.
Symptoms
Some people have no symptoms from the infection. Others may have mouth ulcers the first time the virus gets into the body.
Warning symptoms include:
- Itching of the lips or skin around the mouth
- Burning near the lips or mouth area
- Tingling near the lips or mouth area
Before blisters appear, you may have a sore throat, fever, swollen glands in the face or neck, or painful swallowing.
Blisters or a rash may form on your gums, lips, mouth, or throat.
- The blisters can be small and filled with clear yellowish fluid.
- As the sore heals, it becomes yellow and crusty, and then turns into pink skin.
Symptoms most often appear within 1 to 3 weeks after you come into contact with the virus. They may last up to 3 weeks. If symptoms return later, they are usually milder.
Causes and who gets it
Oral herpes is usually caused by the herpes simplex virus type 1, or HSV-1. After the first infection, the virus becomes dormant, or inactive, in the nerve tissue in the face. Sometimes the virus wakes up again and causes cold sores.
Herpes simplex virus type 2 (HSV-2) most often causes genital herpes. However, HSV-2 can sometimes spread to the mouth during oral sex and cause oral herpes.
The virus spreads most easily from a person who has an active outbreak or sore. You can catch it if you have intimate or personal contact with someone who is infected. You can also catch it if you touch an open herpes sore or something that touched the virus, such as razors, towels, or dishes.
Symptoms can be triggered by menstruation or hormone changes, being out in the sun, fever, or stress.
How doctors diagnose it
Your health care provider can diagnose oral herpes by looking at your mouth area. Sometimes a sample of the sore is sent to a laboratory for closer examination. Tests may include a viral culture, a viral DNA test, or a Tzanck test to check for HSV.
Treatment
Symptoms will go away on their own without treatment in 1 to 2 weeks.
Your provider can prescribe medicine to fight the virus. This is called antiviral medicine. It can help reduce pain and make symptoms go away sooner. Medicines used to treat mouth sores include acyclovir, famciclovir, and valacyclovir.
These medicines work best if you take them when you have warning signs of a mouth sore, before any blisters develop. If you get mouth sores often, you may need to take them all the time.
Antiviral skin creams may also be used. However, they are expensive and often only shorten the outbreak by a few hours to a day.
These steps can also help you feel better:
- Put ice in a washcloth or use a warm washcloth on the sores to ease pain.
- Wash the blisters gently with antiseptic (germ-fighting) soap and water. This helps stop the virus from spreading to other body areas.
- Avoid hot drinks, spicy and salty foods, and citrus.
- Rinse with salt water.
- Take a pain reliever such as acetaminophen or ibuprofen.
When to see a doctor
Contact your provider if your symptoms are severe or do not go away after 2 weeks. Also contact your provider if you have sores or blisters near your eyes. Contact your provider if you have herpes symptoms and a weakened immune system due to certain diseases or medicines.
Herpes infection may be severe and dangerous if it is in or near the eye, or if you have a weakened immune system. Herpes infection of the eye is a leading cause of blindness in the United States.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Either can look at your sores and prescribe antiviral medicine if it is needed.
Common questions
How long does oral herpes last?
Oral herpes most often goes away by itself in 1 to 2 weeks. However, it may come back.
Is oral herpes contagious?
Yes, oral herpes is contagious. The virus spreads most easily from a person with an active outbreak or sore. It can sometimes spread even when there are no mouth sores or blisters.
Is a cold sore the same as a canker sore?
No, a cold sore is not the same as a canker sore. Canker sores are not contagious.
Can oral herpes spread to the genitals?
Yes, oral herpes can spread to the genitals. Do not have oral sex if you have oral herpes, especially if you have blisters.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
