This is a premalignant condition of the lower lip vermilion caused by sun damage, presenting with dryness and scaling, unlike the inflamed, fissured skin at the corners of the mouth in angular cheilitis.
This would typically involve the entire lip or perioral area in a pattern corresponding to an allergen, rather than being localized specifically to the oral commissures.
DLE presents with atrophic, scarred plaques, which is a different morphology than the moist, erythematous fissures of angular cheilitis.
This irritant dermatitis affects the skin around the lips in a distribution matching where the tongue can reach, rather than being confined to the corners.
