1. Psychiatric Diseases and Conditions and Common Behavioral Attitudes in Patients with Lip and Perioral Inflammation
The inflammation of the lips and perioral skin may be related to, or triggered by, some patients’ habits or psychological condition. Older literature data have already confirmed that licking of the lips is a crucial trigger for irritant contact cheilitis
[1][2]. According to other literature data, among subjects with exfoliative cheilitis, mainly female, the main undesirable habit was lip licking (53%), and 40% of the patients had a history of a mental disorder
[3].
Of other habits, one of the most unfavorable habits related to lip inflammation is frequent or prolonged sun exposure
[4]. Actinic cheilitis is considered a premalignant lesion to carcinoma of the lip and has a high probability of developing into invasive squamous cell carcinoma (SCC)
[4][5][6][7][8]. Almost all SCCs (95%) of the lower lip develop on pre-existing actinic cheilitis
[6][7]. Other risk factors include fair skin, aging, occupation or daily activities which involve intense sun exposure (more than four hours daily), male gender, immunosuppression, latitude of residence, genetic predisposition, and others
[4][9]. Actinic cheilitis often has asymptomatic lesions, but some patients report dryness, cracking, burning, stinging, pain, or even abnormal mobility of the lips
[10]. In recent research, patients with actinic cheilitis reported that they were often or very often exposed to the sun, never or almost never use a hat or cap during sun exposure, and never/almost never use protective creams
[11].
Aside from behavior, inflammation of the lips and perioral skin may also be associated with some psychiatric diseases and conditions
[12]. For example, an association between exfoliative cheilitis and anxious conditions (
le tic des lèvres) has been recorded in the research literature
[12]. In addition, some researchers have singled out factitial cheilitis as a special type of cheilitis caused by habits patients are unaware of
[12][13]. According to recent research on different types of cheilitis and psychiatric diseases associated with cheilitis, anxiety was more commonly recorded in patients with exfoliative cheilitis
[11]. Previous research on the occurrence of oral lesions in patients with eating disorders (anorexia, bulimia, and nonspecific eating disorders) showed that oral lesions were observed in most of these patients (94%)
[14]. Furthermore, the occurrence of exfoliative cheilitis caused by undesirable habits is associated with a higher incidence of stress and anxiety
[15][16]. Other research on cheilitis patients showed that the largest percentage of them exhibiting high stress were those with exfoliative cheilitis
[11]. In cheilitis simplex, low stress is somewhat more frequent in those who do not have recurrent lesions than in those who do. Moreover, mental stress and psychiatric disorders (e.g., personality disorders) can lead to undesirable habits and self-harm (biting, sucking, pulling, and licking) in factitial cheilitis, as in exfoliative cheilitis
[17]. In addition, it is known that patients with atopic dermatitis (in which cheilitis is a typical manifestation) are prone to anxiety and depression
[18][19].
In addition, patients with herpetic cheilitis often mention its association with stress. Recently, psychological stress levels were compared between patients with herpetic cheilitis and a healthy group, and significantly higher stress levels were seen in the patients with herpetic cheilitis
[11]. In an older study on herpetic cheilitis, eighteen subjects completed a questionnaire on stressful events at two different times—during the latent phase of viral infection when they had no symptoms and in the active phase of disease. The results showed that, in the active phase of viral infection, patients experienced higher numbers of stressful events, as well as anxiety and daily falls, all of which differed significantly from the results recorded during the latent phase of the disease
[20]. Despite these psychological factors related to lip inflammation, generally, psychiatrists and mental health professionals are rarely involved in a patient’s treatment for cheilitis, which could make a great difference in treatment efficacy. For example, one study showed that the use of an antidepressant, a selective serotonin reuptake inhibitor (fluoxetine), led to the improvement of lip inflammation
[12].
2. Allergies Associated with Lip and Perioral Inflammation
Inflammation of the lips and perioral skin can be triggered by different allergens. Allergens associated with cheilitis are predominantly cosmetic and decorative products (e.g., lipstick, toothpaste, nail polish, and lip balm), dental materials, metals found in musical instruments, food, drugs, etc.
[21][22][23][24][25]. Allergic contact cheilitis typically manifests with dryness, erythema, peeling, and fissures, most often on the lips, with occasional spreading to the perioral skin. Lip inflammation caused by food oftentimes spreads to the perioral skin
[21][22]. Although contact allergic cheilitis is frequently caused by a reaction to balms and lipsticks, other items can also cause an allergic reaction (e.g., pencils or hairpins)
[23]. Allergic contact cheilitis can occasionally leave residual lip hyperpigmentation that resolves over time
[23][26].
Inflammation of the lips or surrounding skin may reflect gender-specific behavior—for instance, allergic contact cheilitis is more frequent among women because they use cosmetics more often, are more aware of changes in their appearance, and seek medical attention more often than men
[27]. The prevalence of this type of cheilitis increases with age, given the more frequent use of hygienic and cosmetic products
[25][28].
The prevalence of allergic reactions is generally more frequent in patients with cheilitis compared to patients with perioral diseases. Allergies to contact allergens more commonly manifest as cheilitis, while other allergy-related oral manifestations include gingivitis, stomatitis, perioral dermatitis, lichenoid reaction, etc. However, contact allergic reactions have been most frequently found in patients with cheilitis
[26][29][30]. Previous studies in patients with oral and perioral manifestations have shown that 60% of patients with cheilitis had a positive patch test reaction, more often than in other conditions involving this area (angioedema, oral lichen planus, gingivostomatitis, and perioral dermatitis)
[31]. A study of 121 dermatological patients also showed that contact allergies are relatively common in patients with cheilitis and perioral dermatitis (41.9% of the subjects had a positive patch test to allergens from the dental series), ranking them third, after orofacial granulomatosis and burning mouth syndrome
[32].
Inflammation of the lips and perioral skin is relatively often caused by contact irritation and allergic reactions, especially to metals such as nickel, mercury, cobalt, chromium, impression materials, eugenol, and others. When a patient presents with lesions in this area, it is important to take a history of the patient’s use of these and other substances used in dentistry, as they can cause an allergic reaction
[21][24]. In addition, allergies to cinnamon and benzoates are a potential predisposing factor for granulomatous cheilitis
[22][25][33]. The prevalence of allergies to contact allergens ranges from 25.9% to 75% (according to previous studies, at least one positive patch test reaction was reported by Torgerson et al. in 25.9%, Budimir et al. in 26.7%, Khamaysi et al. in 41.9%, and Kim et al. in 75% of cases)
[30][31][32][34]. Overall, the most common allergens confirmed by patch test were cobalt chloride, nickel sulfate, and mercury precipitate
[30][31]. In the study conducted by Zoli et al., which performed patch tests with the standard series of allergens, nickel sulfate was the most common allergen, followed by thimerosal and cobalt chloride
[28]. Other frequently mentioned contact allergens include balsam of Peru, fragrances, benzophenone, gold, and other allergens
[35]. Cobalt chloride is widely used in the chemical and pharmaceutical industries (e.g., in dyes and vitamin products and as an additive to animal feed). It is important to note that cobalt hypersensitivity is often associated with nickel hypersensitivity, and patients should be informed of this
[36]. Nickel is a metal found in drinking water, jewelry, fertilizer, food, crockery, paints, and cutlery, among other products. Thimerosal is used as a preservative in a variety of cosmetic and ophthalmic products as well as vaccines
[25][36]. In older articles, reactions to gold have been reported in patients with oral diseases; however, this is not common nowadays.
Inflammation of the lips and perioral skin can also be caused by other, noncontact allergens
[25]. According to research by Budimir et al., atopy-related reactions to inhalant allergens were found in 30% of patients with cheilitis, most commonly weed pollen, grass pollen, and dust
[31]. An association between cheilitis and food allergies is also possible. According to literature data, 13.3% of patients with cheilitis showed evidence of a food allergy, most commonly to fruit, vegetables, and preservatives (e.g., glutaraldehyde, glutamate, and citric acid)
[31]. Recent studies in patients with various oral and perioral skin diseases have shown that immediate-type allergic reactions (positive prick test) to food and additives were more frequently confirmed in patients with cheilitis (33.3%), whereas they were less frequent in patients with perioral dermatitis (10%)
[37]. Patients with atopic dermatitis are also prone to lip inflammation (
Figure 1). The percentage of atopic patients tested with allergy tests ranges from 19% to 34.9% in the research literature. In a study by Freeman et al., atopy was found in 19% of patients, while studies by Lim et al. and Zoli et al. showed that approximately one-third of subjects had atopy
[1][2][28]. However, the number of atopic patients in studies depends on the populations tested and the allergen sets used in the tests. According to research by Blagec et al. on patients with lip inflammation, the percentage of atopic patients was even higher—84% (positive prick test result to at least one allergen)
[25].
Figure 1. Cheilitis and periorificial lesions in patient with confirmed allergies (atopic dermatitis) (A), positive prick test to inhalant allergens (B), and positive patch test to contact allergens (C).
A patch test for contact allergens, performed with standard contact allergens, is essential in the assessment of contact cheilitis; however, possible allergens to personal products not included in the standard allergen series should also be considered
[21]. In addition to patch tests, prick tests are also essential to confirm other mechanisms of IgE-mediated reaction (e.g., contact urticaria) and should be performed when indicated by the patient’s medical history
[1][2][25][27][28][30][34][38]. Contact urticaria with lip manifestations is also possible on this part of the skin and can be triggered by food, preservatives, odors, and other factors (e.g., mint in toothpaste—with a positive prick test to mint leaves and negative patch test)
[38]. Performing prick tests to assess and confirm food allergens is important for the diagnosis of so-called food cheilitis or lip manifestations in food allergic reactions
[24]. In addition to patch tests, prick tests are sometimes needed to diagnose cheilitis, as they may be decisive in determining the cause of the lesions
[1][2][25][27][28][30][34].
However, the clinical significance of positive allergy tests in patients remains to be established
[25][31]. For this reason, patients are advised to avoid potential allergens in order to determine the relevance of the allergen to the disease itself
[25].
3. Nutritional Deficiencies and Microbiome Changes in Patients with Lip and Perioral Inflammation
Inflammation of the lips and perioral skin can be related to various nutritional factors. Cheilitis can be linked to various vitamin and mineral deficiencies, such as iron (sideropenic anemia)
[39][40][41]. Angular cheilitis can be caused by deficiencies of vitamin B2 (riboflavin), vitamin B3 (niacin), vitamin B6 (pyridoxine), vitamin B7 (biotin), vitamin B9 (folic acid), vitamin B12 (cyanocobalamin), and zinc, as well as protein deficiencies
[21][23][39][40][41][42]. Additionally, studies have shown that angular cheilitis is a common clinical manifestation of sideropenic and megaloblastic anemia
[41]. Exfoliative cheilitis can also be associated with iron deficiency (sideropenic anemia) and vitamin B12 deficiency
[22].
Individuals with excess skin or wrinkles at the corner of the mouth may be prone to
Candida overgrowth, leading to angular cheilitis
[43]. Patients with Plummer–Vinson syndrome commonly present with angular cheilitis (along with anemia and dysphagia) mostly due to iron deficiency; therefore, iron supplementation is essential in the treatment of these patients
[44]. A study analyzing children with vitamin B12 deficiency reported clinical features of cheilitis in 7.01% of patients. These patients were given cobalamin and saw complete resolution of lip inflammation
[45]. A similar study analyzed dermatological signs of vitamin B12 deficiency in infants and found that 6.07% of participants presented with angular cheilitis. The most common sign of vitamin B12 deficiency on the skin, observed in almost all patients, was cutaneous hyperpigmentation
[46]. Recent studies carried out in patients with cheilitis, analyzing levels of vitamin B9, vitamin B12, and iron, showed that only a small number of patients had abnormalities
[11]. However, nutritional deficiencies should be considered in resistant cases. Abnormalities in zinc metabolism can cause disorders that usually manifest themselves on the skin, such as
acrodermatitis enteropathica, an autosomal recessive genetic disorder of zinc deficiency.
Acrodermatitis enteropathica presents with the triad of periorificial dermatitis, alopecia, and diarrhea. Oral zinc replacement therapy usually leads to a rapid clinical remission of this disorder
[47]. In patients with perioral dermatitis and proven zinc deficiency, zinc supplementation can effectively improve the skin’s condition
[48].