What triggers perioral dermatitis?

Which triggers should you check first?

• Facial steroid creams: topical corticosteroids, meaning steroids applied to the skin, can cause perioral dermatitis. Potent steroids can make the rash significantly worse.
• Face creams: moisturisers and sunscreen are possible starting triggers. Face cream includes both moisturiser and sunscreen, however many separate jobs the bathroom shelf assigns them.
• Fluoride exposure: fluoride in toothpaste or water is a possible cause, not a reason to assume every case started with toothpaste.

Should you stop a steroid cream?

Do not start a steroid cream to treat an undiagnosed rash around your mouth. If you already use one regularly, contact the prescriber about how to withdraw it rather than stopping abruptly. Withdrawal can cause a severe flare, and a clinician can plan a reduction in strength or application frequency. Tell your doctor or pharmacist if you have perioral dermatitis before using betamethasone. A steroid prescribed for another skin condition is not automatically suitable for this rash.124

What should you do about possible triggers?

1. 1Have the rash assessed. Perioral dermatitis can resemble acne or rosacea, so the diagnosis matters before choosing a treatment.
2. 2Review facial steroid use with your clinician, including the product and how often you apply it. Arrange a withdrawal plan if needed.
3. 3Pause face creams and makeup as part of managing confirmed perioral dermatitis. Discuss possible moisturiser and sunscreen triggers rather than adding more products to the rash.
4. 4Cleanse with mild soap and warm water twice daily. A clinician can also decide whether prescription treatment is needed.

Treatment is not necessarily quick. Oral tetracycline or related antibiotics are used for one to three months; other prescription options include erythromycin and topical treatments. These require a clinician's choice, not a shopping list. A flare after withdrawing a steroid needs review rather than an automatic return to the same cream.2

Is every rash around the mouth perioral dermatitis?

No. Perioral dermatitis can produce clusters of small, slightly scaly bumps around the mouth, chin and nose, often sparing the skin immediately beside the lips. The broader term periorificial dermatitis also covers involvement around the eyes and nostrils. Women and people aged 15 to 45 have a higher risk, but age and sex do not identify the trigger. Dermatitis is not contagious and does not mean your skin is unclean.23

Can foods trigger perioral dermatitis?

There is no established food avoidance list for perioral dermatitis here. Food triggers are recognised in some cases of atopic dermatitis, meaning eczema, and systemic contact dermatitis, a reaction to swallowed allergens. Those are different diagnoses. Do not turn lists of common food allergens into a perioral dermatitis diet. If you repeatedly notice symptoms after a particular food, discuss that pattern with a clinician. Recording the food, timing and symptoms is more useful than putting the entire supermarket on trial.5

Hives, itchy lips or tongue, swelling and wheezing after eating suggest a possible food allergy rather than simply a skincare trigger. Allergy symptoms usually begin within two hours. Seek an allergist's assessment for suspected food allergy; a positive blood or skin test alone does not diagnose it. Do not deliberately eat a suspected food to test a reaction yourself. Call your local emergency number for breathing difficulty or a serious reaction after eating.56