Perioral Dermatitis: The Rash Around the Mouth Often Mistaken for Acne
Perioral Dermatitis (POD) is a chronic inflammatory rash that appears around the mouth, nose and sometimes the eyes. It is common in working-age women aged 20–45 and is often mistaken for inflamed acne or Rosacea, even though the causes and treatments are completely different. A wrong diagnosis leads many people to use creams that make the condition worse. This article explains the features that help tell the conditions apart, the true causes and the correct principles of treatment.
What is Perioral Dermatitis?
This condition is a rash of small red bumps or tiny pustules around the lips, in the creases beside the nose and on the eyelids. Key features that help distinguish it from acne include:
Specific location: The rash always leaves a gap of about 3–5 millimetres from the lip border, a distinctive feature that helps separate it from acne.
Sensation: Patients often feel burning, itching or tightness of the skin, more so than with ordinary acne.
Course of the disease: Symptoms tend to flare up and improve in turn, without a clear reason.
What causes Perioral Dermatitis?
The main cause of Perioral Dermatitis is long-term use of steroid cream on the face, whether prescribed by a doctor or bought without knowing it contains a steroid. Other related factors include:
Toothpaste: Toothpaste with a high fluoride content.
Skincare: Very thick moisturizers or skincare creams (occlusive formulas).
Cosmetics: Foundation or heavy, cream-textured sunscreen.
Sprays: Inhaled corticosteroid sprays (inhaled steroids).
Beware of steroid rebound
When steroid cream is used, the condition may improve temporarily, but once it is stopped it returns worse than before, so people keep going back to the cream again and again. The skin becomes thinner, tiny blood vessels widen and the rash spreads further. This phenomenon is called steroid rebound, and it is why steroid cream must never be used to treat Perioral Dermatitis.
How is Perioral Dermatitis treated?
The treatment principle is called Zero Therapy: stop all causes first, then use suitable medication under the care of a dermatologist.
Step one, stop the causes (Zero Therapy): Stop using every kind of steroid cream on the face immediately, switch to a fluoride-free toothpaste and avoid thick moisturizers.
Topical medication: A doctor may consider metronidazole cream or azelaic acid cream.
Oral medication: In severe cases, a doctor may prescribe oral tetracycline or doxycycline.
Duration: Treatment may take 6–12 weeks before clear results appear, so patience is needed.
When should you see a dermatologist?
If the rash around the mouth does not respond to self-care within 2 weeks, or you have severe burning, a spreading rash or repeated flare-ups, consult a dermatologist for an accurate diagnosis. This condition looks like many others, and correct treatment from the start shortens the course and helps prevent recurrence.
Frequently asked questions
Is Perioral Dermatitis acne? No. Although it looks like acne, it is a different type of inflammatory rash. The key sign is that the rash always leaves a 3–5 millimetre gap from the lip border, and it often burns or feels tight.
Why must steroid cream not be used? Because steroids give temporary improvement but cause steroid rebound: after stopping, the condition returns worse, the skin becomes thinner, tiny blood vessels widen and the rash spreads further. This is the main culprit behind this condition.
How long does Perioral Dermatitis take to treat? Treatment usually takes 6–12 weeks before clear results appear, and requires stopping all causes while continuing the medication prescribed by the doctor.
When should you see a doctor? See a doctor if the rash does not improve within 2 weeks, if there is severe burning, if the rash spreads or if it keeps coming back.
Perioral Dermatitis can be treated if it is diagnosed correctly and the causes are properly stopped. If you have a rash around the mouth that does not go away on its own, consult a dermatologist at Siam Dermatology, call +66 61 448 7000 or LINE @siamderm
Written by Dr. Patara Voravutinon, Dermatologist · Last reviewed July 16, 2026
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