PMC5066016_01
Ulcerative lichen planus on the buccal mucosa presenting as a central ulcer with pseudomembrane and keratotic plaques at the periphery.
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fig9
There are different subtypes of OLP with different clinical presentations: reticular (lace-like keratotic mucosal configuration, Wickham's striae), atrophic (keratotic changes combined with mucosal erythema), erosive/ulcerative (pseudomembrane covered ulcerations combined with keratosis and erythema), bullous (vesiculobullous presentation combined with reticular or erosive patterns), and popular/plaque like (keratotic changes with elevation adjacent to the normal mucosa) (Figure 9).
Recurrent aphthous stomatitis as a symmetrical ulcer with pseudomembrane and inflammatory halo.
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fig10
Oral aphthous ulcers typically occur as painful, symmetrically round fibrin-covered mucosal defects with an erythematous border and most commonly on nonkeratinized mucosa in healthy patients (Figure 10).
Recurrent herpes labialis presented as multiple vesicles and scalloped-border erosions coated with crust.
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fig11
There are two subgroups: recurrent herpes simplex labialis (HSL) (Figure 11), which is more commonly seen in healthy subjects.