Lip-Licker’s Dermatitis

Lip-licker’s dermatitis is an irritant contact dermatitis of the lips (eczematous cheilitis) and the skin around them. It is caused by the child’s own saliva. Repeated, often unconscious, licking keeps re-wetting the skin. The constant wet–dry cycle breaks down the skin barrier, and the resulting soreness and dryness prompt more licking, so the cycle feeds itself (DermNet 2020). It often starts with chapping in cold, dry weather and is typically worse in winter. It is classically described in school-age children but occurs at any age (DermNet). In toddlers it continues on from Drool Dermatitis, the same saliva mechanism in teething infants (Children’s Mercy 2024). Siegfried & Hebert (J Clin Med 2015) and Napolitano et al. (Dermatol Ther 2022) both list drool and lip-licking as the main endogenous irritants causing facial contact dermatitis in children.

Lip-Licker’s Dermatitis [part-of] Irritant Contact Dermatitis Drool Dermatitis [precedes] Lip-Licker’s Dermatitis Lip-Licker’s Dermatitis [relates] Itch-Scratch Cycle

How it looks, and how it differs from atopic eczema around the mouth. The rash is a red, dry, scaly, sometimes cracked band whose outline matches the reach of the tongue. It crosses the vermilion border onto the lip itself, and the child may complain of burning (DermNet). Toddlers with Atopic Dermatitis are more prone to it because their barrier is already weak, and AD itself can affect the area around the mouth from about age 2 (Napolitano 2022). The clue that separates the two is the sharp “tongue-shaped” edge and a visible licking habit, compared with the more patchy, itchy AD elsewhere on the face, neck and body. Watching the child for a few minutes often settles the question, although direct observation is not required for diagnosis (DermNet).

Lip-Licker’s Dermatitis [relates] Atopic Dermatitis Lip-Licker’s Dermatitis [part-of] Differential Diagnosis of Toddler Eczema

Other look-alikes. Perioral Dermatitis (periorificial dermatitis) causes small red papules and pustules around the mouth, nose and eyes, often after steroid use on the face. It characteristically spares a narrow rim of skin right next to the lip and does not involve the vermilion, whereas lip-licker’s dermatitis hugs and crosses the lip line (DermNet; Children’s Mercy 2024). Allergic Contact Dermatitis (allergic contact cheilitis), for example to lip balms, toothpaste flavours, fragrance or foods, tends to come and go with exposure. When the pattern does not fit, it is confirmed by Patch Testing (DermNet). Skin breakdown can become infected with Staphylococcus aureus or Candida (Candidiasis), and chronic inflammation can leave Post-Inflammatory Hyperpigmentation or lighter patches, especially on darker skin (DermNet).

Perioral Dermatitis [contradicts] Lip-Licker’s Dermatitis Allergic Contact Dermatitis [relates] Lip-Licker’s Dermatitis Lip-Licker’s Dermatitis [causes] Post-Inflammatory Hyperpigmentation

Management. Breaking the licking habit is essential (DermNet). With toddlers this usually means gentle distraction and redirection rather than scolding (see Habit Reversal). Apply a thick, bland, fragrance-free emollient or Petrolatum barrier to the lips and the licked zone often, especially before meals, naps and outdoor play in the cold. A thick barrier makes saliva and food less irritating, and the greasy feel can discourage licking. For inflamed skin, a clinician may advise a short course of a mild topical steroid such as Hydrocortisone ointment, or a topical calcineurin inhibitor such as Tacrolimus or Pimecrolimus (DermNet). Calcineurin inhibitors are often preferred on the face for longer use because they do not thin the skin. Flavoured or fragranced lip balms are best avoided, because they can add an allergic contact dermatitis on top. The condition usually resolves with treatment but recurs if the licking continues (DermNet).

Fragranced and flavoured lip products on cracked lips

Scented or flavoured lip balms can sensitise broken skin and add an allergic contact cheilitis to the irritant rash. Use plain petrolatum or an unperfumed ointment; see Fragrance Allergy.

Petrolatum [treats] Lip-Licker’s Dermatitis Hydrocortisone [treats] Lip-Licker’s Dermatitis Topical Calcineurin Inhibitors [treats] Lip-Licker’s Dermatitis Habit Reversal [prevents] Lip-Licker’s Dermatitis

Connections

• Drool Dermatitis — same saliva-irritant mechanism, older-child form, source: Children’s Mercy 2024
• Perioral Dermatitis — differential diagnosis, source: Children’s Mercy 2024
• Irritant Contact Dermatitis — lip-licker’s dermatitis is a saliva-driven ICD, source: DermNet 2020
• Atopic Dermatitis — weak barrier predisposes; perioral AD in toddlers is the main mimic, source: Napolitano 2022
• Allergic Contact Dermatitis — allergic contact cheilitis differential, source: DermNet 2020
• Patch Testing — confirms allergic cheilitis, source: DermNet 2020
• Topical Calcineurin Inhibitors — tacrolimus/pimecrolimus option, source: DermNet 2020
• Hydrocortisone — mild steroid ointment option, source: DermNet 2020
• Petrolatum — barrier for lips, source: DermNet 2020
• Habit Reversal — stopping the licking is essential, source: DermNet 2020
• Staphylococcus aureus — secondary infection risk, source: DermNet 2020
• Candidiasis — secondary yeast infection risk, source: DermNet 2020
• Post-Inflammatory Hyperpigmentation — chronic inflammation sequel, source: DermNet 2020
• Fragrance Allergy — avoid scented lip balms, source: DermNet 2020