What condition causes peeling of the lips?
Lip peeling, or desquamation of the lips, is not a specific disease in itself but rather a common symptom that can arise from multiple underlying causes. The most frequent cause is cheilitis—particularly irritant or allergic contact cheilitis—often triggered by environmental factors such as cold, dry air, wind exposure, or habitual lip licking. Chronic sun exposure may lead to actinic cheilitis, a precancerous condition characterized by persistent scaling, fissuring, and sometimes leukoplakia on the lower lip.
Other potential etiologies include atopic dermatitis (especially in individuals with a personal or family history of eczema, asthma, or allergic rhinitis), nutritional deficiencies (notably riboflavin [vitamin B2], iron, folate, or niacin), and infections—such as candidal cheilitis (often presenting with erythema, fissures at the oral commissures, and satellite lesions) or herpes simplex virus reactivation (typically associated with grouped vesicles, pain, and crusting).
Less common but important considerations include autoimmune conditions like systemic lupus erythematosus (which may manifest with discoid lesions, telangiectasias, and mucosal ulceration) or lichen planus (featuring reticulated white striae or erosive patches). Rarely, chronic peeling may signal early squamous cell carcinoma—particularly if unilateral, non-healing, indurated, or associated with ulceration or bleeding.
A thorough clinical evaluation—including detailed history (e.g., duration, triggers, product use, systemic symptoms), physical examination (assessing symmetry, texture, color, involvement of vermilion border or perioral skin), and, when indicated, diagnostic testing (e.g., patch testing, fungal culture, biopsy)—is essential to determine the correct diagnosis and guide appropriate management.