Psoriasis of the Lips: A Case Report with Review of the Literature Open Access

Psoriasis is a common inflammatory chronic disease. It affects 1–3% of the general population. Psoriasis is usually localized in the extremities, trunk, scalp, and nails. It may occasionally involve genitalia and the anus. However, cutaneous lesions are generally sufficient to make diagnosis clinically. Diagnostic difficulties can be found in cases with unusual topography. We report a 45-year-old woman who presented psoriasis of lips with review of the literature.

A 45-year-old woman presented with a six-month history of scaling and cracking of the lips without any history of application of topical plants or traditional products. The lesions eventually involved both lips completely. She complained of a burning sensation on her lips and severe discomfort during eating and speaking (Fig. 1). The history revealed the notion of erythematous scaly scalp lesions appearing 2 months before the lesions of the lips. Dermatological examination found diffuse mild erythema, adherent white scales, and fissuring on both upper and lower lips, with extension over the vermilion border. The remaining oral mucosa appeared normal. Moreover, there were erythematous plaques with white thick scales on the scalp.

Dermoscopic examination showed dots and globular vessels, diffuse, and monomorphic with a white scale (Fig. 2, 2, 3). Dermoscopic of the scalp’s lesions also showed dots and glomerular vessels with homogeneous distribution and thick white scales. Thus, on the basis of the clinical and dermoscopic appearance, the diagnosis of psoriasis of the lips and scalp was made.

The cheilitis was treated by hydrocortisone aceponate, and the scalp was treated by betamethasone associated with salicylic acid. At the 15 days control, she reported a great improvement.

Intraoral psoriasis and psoriasis of the lips remain a poorly recognized entity, especially in the absence of associated skin involvement [1]. Psoriasis of the lips can be the only clinical presentation of psoriasis, preceding the appearance of typical psoriasis lesions or as in our case occurring after the appearance of skin lesions [1].

The localization of psoriasis in the lips has been rarely reported in the literature, to our knowledge since 2000 and until now only fifteen cases have been reported in the literature including our case. Ten of the cases were female and 5 male, the mean age of the patients was 28.86 years (13–65 years), extra-labial involvement was found in 6 patients with typical skin lesions in 4 cases, vulva involvement in one case, nail involvement in one case and scalp involvement in 2 cases. Only the case reported by Migliari et al. had intraoral involvement [1-13] (Table 1).

Brenner et al. [14] reported a case with lip psoriasis, which was triggered by protruding teeth. Their case did not clear with any type of dermatological treatments including topical corticosteroids and calcipotriol; however, the lesions on the lips completely resolved after replacement of the protruding teeth by a nonirritating prosthesis.

Psoriasis of the lips can be clinically confused with chronic eczema, actinic cheilitis, chronic candidiasis, and leukoplakia [2]. Dermoscopy is a noninvasive tool that allows the diagnosis of many cutaneous dermatoses and reduces the need for biopsies. The most striking dermoscopic features of psoriasis are the evenly distributed red dots or globules over a pale red erythematous background along with white scaling of the lesion [15].

An additional dermoscopic finding of high relevance for psoriasis is the white scaling, which can be very helpful clue for the differential diagnosis between psoriasis and other inflammatory skin diseases. Specifically, the white color of psoriatic scales is of particular value for the diagnosis of psoriasis compared with the yellow scales or crusts that are usually suggestive of dermatitis [15]. Several treatments have been used in the literature: topical strong to very strong topical steroid, calcipotriol, tacrolimus, vitamin A derivatives, salicylic acid, and methotrexate with good outcome in most cases [1-13].

Through our case, we report the utility of the dermoscopic examination in the diagnosis of psoriasis even in unusual locations.

The study was conducted in accordance with the Declaration of Helsinki. Written informed consent for the publication of this report, including images, was obtained from patient.

The authors have no conflicts of interest to declare.

This study did not receive any funding.

R.C. admitted and exanimated the patient in consultation, performed dermoscopic examination, and treated the patient. The patient still followed in consultation by R.C. in the Department of Dermatology, University Hospital Hassan 2, Agadir, Morocco. Moreover, R.C. has written and submitted the manuscript in the journal.