What is a common feature of erosive lichen planus that might be noted during an examination?

Erosive lichen planus is characterized by specific oral manifestations, and one of the most notable features observed during an examination is the presence of erosive lesions, particularly on the buccal mucosa or cheeks. These lesions are often painful, may cause discomfort, and can lead to ulcerations, making it essential for practitioners to recognize them as potential signs of this condition. The lesions typically present as areas of redness with a shiny, erosive surface, distinguishing them from other forms of lichen planus, which may present with white striae (Wickham's striae) without the erosive components.

In contrast, the other options do not relate directly to the symptoms of erosive lichen planus. Hard tissue calcification is not a feature of this condition; curious swelling of the gums can be associated with various periodontal diseases rather than directly with erosive lichen planus; black discoloration of teeth is typically connected to dental caries, staining, or other dental issues, not lichen planus. Thus, the presence of erosive lesions on the cheek is the hallmark feature that correctly identifies erosive lichen planus during an examination.