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These two mouth irritants aren鈥檛 the same thing. Find out how to tell which one you might have and, better yet, what to do about them.

Although sores in and around the mouth may be embarrassing, they shouldn鈥檛 be, because they鈥檙e very common. At least gets canker sores, and about the same amount gets the virus that can cause cold sores. But the two types of sores are completely different, so here鈥檚 what you need to know to tell them apart.

1. Known versus unknown causes

Cold sores, also called fever blisters or oral herpes, are most often caused by the herpes simplex virus type 1, which people usually pick up in childhood. Although the virus then settles into bundles of nerve cells in the body and may never bother you again, it stays with you for the rest of your life and can pop up from time to time.

The causes of canker sores, or aphthous ulcers, are less known. It may be that the immune system mistakenly attacks the mucous cells of the mouth. Canker sores are also linked to Crohn鈥檚 disease and other systemic conditions, including nutritional deficiencies; they may also be caused by stress, hormonal shifts or allergic reactions to certain ingredients in food or toothpaste.

2. Oozing blister outside the mouth versus painful ulcer inside

The way cold sores and canker sores appear is very different, too. Cold sores occur most often outside your mouth, in the corners or on your lip. If you find one inside, it鈥檚 usually on harder tissue, such as your gums or the roof of your mouth. Cold sores form blisters that then break open, ooze and crust over. You may feel a tingling or burning sensation before a blister appears.

Canker sores are small and round or oval and develop in the soft tissue inside your mouth. You might get one behind your lip, on the inside of your cheek or under your tongue. They鈥檙e red, flat and often have a whitish top. If they become large or painful, they may prevent you from comfortably eating and drinking.

3. Contagious versus not contagious

Perhaps the most important thing to know is whether these conditions can be passed to others. Cold sores are highly contagious, especially when you have an active one 鈥� but you can transmit the virus even when you don鈥檛. It鈥檚 spread by saliva or skin contact. If you touch your cold sore, wash your hands right away to avoid spreading the virus to other parts of your skin.

Canker sores, on the other hand, aren鈥檛 contagious, so you don鈥檛 have to worry about giving them to anyone else.

If they do show up, what鈥檚 the best treatment?

Most of the time, both types of sores will heal by themselves within a week or two, but medications are available to ease their effects.

For cold sores, taking an antiviral medication at the earliest sign may reduce pain and shorten the outbreak, according to Sharon Orrange, MD, a primary care physician with Keck Signature Care, part of 喵咪社区. The type of medication you choose, however, can have an impact.

鈥淭opical medications for cold sores don鈥檛 work that well, are expensive and usually require frequent daily applications,鈥� Dr. Orrange says. 鈥淏ut evidence shows that drugs such as valacyclovir effectively reduce both healing time and the duration of pain.鈥�

For small, painful canker sores, she suggests using an over-the-counter numbing medication. But if you have large painful canker sores that are making it difficult to eat, you should ask your physician for help.

鈥淧rescription pastes and gels are available that can help speed your healing,鈥� Orrange says. 鈥淎lso, see your doctor if your canker sores recur, because the recurrence could indicate celiac disease, inflammatory bowel disease or HIV.鈥�

Although they鈥檙e annoying, sometimes painful and can鈥檛 be cured, there鈥檚 good news about canker and cold sores: In the majority of cases, both are relatively harmless and don鈥檛 have lasting consequences.

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