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Types of Mouth Ulcers

Understanding the Different Forms

Mouth ulcers are one of the most common oral health concerns, affecting people of all ages. While many ulcers heal naturally within one to two weeks, understanding the type of ulcer you have can help you manage discomfort and know when professional advice may be needed.

At UlcerEze, we believe that informed oral care starts with understanding the condition. Below are the most common types of mouth ulcers and how they differ.

Types of Mouth Ulcers

Not all mouth ulcers are the same. They can vary in size, severity, appearance, and how long they take to heal. Understanding the different types of mouth ulcers can help you identify your symptoms, recognise common causes, and know when it’s time to seek professional advice. Explore the most common types of mouth ulcers and learn how they may affect your daily oral health.

Minor Mouth Ulcers

Minor ulcers are the most common type, accounting for the majority of cases.

Characteristics

  • Small, round or oval sores
  • White, yellow, or grey centre with a red border
  • Usually less than 10 mm in diameter
  • Heal naturally within 7–14 days
  • Typically leave no scarring

 

Although minor ulcers often heal without treatment, they can still make eating, drinking, and speaking uncomfortable.

Major Mouth Ulcers

Major ulcers are larger and deeper than minor ulcers.

Characteristics

  • Larger than 10 mm
  • More painful
  • May last several weeks
  • Can leave scarring after healing
  • May interfere with eating and speaking

 

Because they persist longer, major ulcers may require assessment by a healthcare professional, particularly if they continue to recur.

Herpetiform Mouth Ulcers

Despite the name, herpetiform ulcers are not caused by the herpes virus.

Characteristics

  • Numerous tiny ulcers appearing in clusters
  • Individual ulcers may merge into larger sores
  • Can be particularly painful
  • Often recur more frequently
  • Usually heal within 1–2 weeks

 

These ulcers are less common but may significantly affect everyday comfort.

Traumatic Mouth Ulcers

These ulcers develop after irritation or injury to the lining of the mouth.

Common causes include:

  • Accidentally biting the cheek or tongue
  • Sharp or broken teeth
  • Dental braces or orthodontic appliances
  • Poorly fitting dentures
  • Hard or sharp foods

 

Removing the source of irritation often allows healing to begin naturally.

Recurrent Aphthous Ulcers

Some people experience ulcers that repeatedly return throughout the year.

Recurring ulcers may be linked to:

  • Stress
  • Minor mouth trauma
  • Nutritional deficiencies
  • Hormonal changes
  • Family history

 

Understanding possible triggers may help reduce future episodes.

When Should You Seek

Professional Advice?

While most mouth ulcers are harmless, it’s important to seek advice if:

  • An ulcer lasts longer than three weeks
  • Ulcers occur very frequently
  • Pain becomes severe
  • You develop difficulty swallowing
  • Ulcers are accompanied by fever or unexplained weight loss
  • You notice unusually large or persistent sores

 

A healthcare professional can assess whether further investigation is appropriate.

Supporting Everyday Comfort

Although many mouth ulcers heal naturally, protecting the sensitive area from ongoing irritation may help make everyday activities more comfortable.

UlcerEze patches are pharmacist-formulated to create a protective covering over the affected area, supporting your daily oral care routine while allowing you to continue eating, drinking, and speaking with greater comfort.

Frequently Asked Questions

What is the most common type of mouth ulcer?

Minor aphthous ulcers are the most common and usually heal within one to two weeks.

Can different types of ulcers look similar?

Yes. Many ulcers appear white or yellow with a red border, but their size, number, duration, and recurrence often help distinguish them.

Are all mouth ulcers serious?

No. Most are harmless and temporary. However, ulcers lasting longer than three weeks should be assessed by a healthcare professional.