What differences should you look for?
| Clue | Perioral dermatitis | Contact dermatitis |
|---|---|---|
| Appearance | Clusters of small bumps, sometimes with scale or pustules. | Dry, cracked or swollen patches; bumps, blisters and oozing can occur. |
| Location | Around the mouth, sometimes the nose or eyes; the immediate lip border is often spared. | Anywhere exposed to the trigger, including the face, eyelids and lips. |
| Sensation | Burning, tightness or itching; pain is uncommon. | Often intensely itchy; burning, stinging and tenderness also occur. |
| Timing | Can persist for months without treatment. | Usually appears within hours or days of exposure and improves with trigger avoidance. |
| Steroid creams | Can trigger or worsen the rash. | Can be prescribed to relieve severe symptoms. |
Colour is not a reliable dividing line. Perioral bumps can be red on lighter skin or skin coloured on darker skin. Contact dermatitis can look red, dark brown, purple or grey. Contact dermatitis also causes bumps, so a bumpy rash is not automatically perioral dermatitis.245
Does a reaction to skincare mean contact dermatitis?
Not necessarily. Skincare products can be involved in either condition, which makes the bathroom shelf a suspect list rather than a diagnosis. Irritant contact dermatitis happens when a substance damages the skin's outer layer; allergic contact dermatitis involves an immune reaction. Soaps, detergents and repeated water exposure are common irritants. Cosmetics can contain allergens. Perioral dermatitis's exact cause is unclear, but facial steroid use is a strong association.24
Check more than products applied directly to the rash. Shampoo rinsed across an eyelid or nail products transferred by a finger can cause contact dermatitis there. Irritant symptoms can start immediately or within 48 hours; allergic reactions can also be delayed. A dermatologist can use patch testing if contact allergy is suspected.156
What should you do next?
- 1Review steroid use first. If you have been using nonprescription hydrocortisone on suspected perioral dermatitis, stop. Ask the prescriber before changing any prescription steroid. Stopping can cause a flare; do not restart it yourself to suppress that flare.
- 2Remove likely triggers. For contact dermatitis, avoid the suspected irritant or allergen. For suspected perioral dermatitis, pause facial cosmetics and unnecessary topical products, especially heavy creams or ointments that seal the skin.
- 3Match washing and moisturising to the condition. Perioral dermatitis care can start with warm water alone; a mild cleanser without fragrance is another option. Contact dermatitis often benefits from frequent moisturiser and an emollient soap substitute.
- 4Arrange an assessment if the diagnosis is unclear or the rash persists. Treatment differs enough that repeatedly trying an eczema cream on an undiagnosed mouth rash is not a useful plan.
How long does treatment take?
Contact dermatitis usually improves or clears once the trigger is identified and avoided. Perioral dermatitis improves gradually over weeks to months; prescription treatment commonly lasts 4 to 8 weeks and sometimes longer. Doctors can prescribe topical or oral medicines. In children, topical antibiotic treatment typically takes 3 to 8 weeks to clear the rash. Pregnancy and age affect antibiotic choice, so tell the prescriber if you are pregnant or treatment is for a child.1234
When should you get medical help?
See a doctor for persistent, recurring or severe symptoms, or treatment that is not helping. Seek immediate medical advice for a severe reaction or signs of infection: rapidly worsening symptoms, discharge, increasing pain, feeling generally unwell, or feeling hot, cold or shivery.26
Where this answer comes from
- 1Periorificial dermatitis in childrendermnetnz.org
- 2Contact dermatitisnhs.uk
- 3Periorificial dermatitis (Perioral Dermatitis): Authoritative guidancedermnetnz.org
- 4Red rash around your mouth could be perioral dermatitisaad.org
- 5Eczema types: Contact dermatitis signs and symptomsaad.org
- 6Contact dermatitis - Symptomsnhs.uk
