Canker Sore (Aphthous Ulcer)

A small, shallow lesion that develops on the soft tissues in the mouth (inside the lips, cheeks, or under the tongue). Clinically known as Aphthous Stomatitis, they appear as white or yellow centers with a red border.

Why It Matters

Unlike "cold sores" (caused by the Herpes virus), canker sores are not contagious. However, they can be extremely painful, making eating and speaking difficult.

Clinical Details

• Etiology: Exact cause is unclear but triggers include stress, tissue injury (biting the cheek), acidic foods, or SLS-containing toothpaste.

FAQ

What causes canker sores?

Minor injury, immune system strain, hormonal shifts, or deficiencies in Vitamin B-12/Iron.

How to get rid of canker sores?

They are self-limiting, but healing can be aided by avoiding spicy/acidic foods, using saltwater rinses, or applying corticosteroid ointments.

How long do canker sores last?

Typically 7 to 10 days. If a sore persists longer than 2 weeks, it requires a biopsy to rule out oral cancer.