True "pimples" (acne vulgaris) do not occur inside the mouth — sebaceous glands are absent. Intraoral lesions resembling pimples are typically other entities:
Common Intraoral Lesions
- Aphthous Ulcers (Canker Sores): Round/oval, yellow-gray fibrinous center, erythematous halo. Painful. Triggers: stress, trauma, foods (citrus, chocolate), nutritional deficits (B12, folate, iron), hormonal, SLS toothpaste. Heal 7–14 days. Recurrent (RAS).
- Traumatic Ulcers: Biting, sharp tooth/restoration, abrasive food. Resolve in days if cause removed.
- Mucocele: Mucus extravasation cyst (ruptured minor salivary gland duct). Bluish, fluctuant, typically lower lip. May rupture and recur.
- Herpes Simplex (HSV-1): Primary: gingivostomatitis (multiple ulcers, fever). Recurrent: herpes labialis (lip) — rarely intraoral (hard palate, gingiva) — clustered vesicles → ulcers.
- Hand-Foot-Mouth Disease (Coxsackie): Oral vesicles/ulcers + rash.
- Eruptive Lingual Papillitis (Lie Bumps): Transient fungiform papillae inflammation — painful red/white bumps on tongue.
- Oral Cancer: Non-healing ulcer >2 weeks, indurated, fixed, painless early. Risk: tobacco, alcohol, HPV.
Management
- Symptomatic: Topical anesthetics (benzocaine, lidocaine), protective pastes (Orabase), antimicrobial rinses (chlorhexidine), laser therapy.
- Nutritional: B-complex, iron, zinc if deficient.
- Avoid Triggers: SLS-free toothpaste, soft diet.
When to See a Dentist/Doctor
- Ulcer >2 weeks without improvement.
- Recurrent frequent/severe episodes.
- Associated systemic symptoms.
- Suspicious lesion (indurated, fixed, bleeding, leukoplakia/erythroplakia).
