Lichen planus: White striae of right buccal muocsa.

Lichen planus: White striations showing the classic network arrangement, with erythematous mucosa, on the right buccal mucosa.

Lichen planus: White striations on the attached gingiva.

Lichen planus: White striations on the left buccal mucosa.

Lichen planus: White striations on the dorsum of the tongue.

Lichen planus: White striations of the attached gingiva.

Lichen planus: White patch of epithelial thickening adjacent to an ulcer on the left buccal mucosa.

Lichen planus: Diffuse white epithelial thickening of ventral and lateral tongue.

Lichen planus: White patches of epithelial thickening on dorsum of tongue.

Lichen planus, erosive: Painful ulcers and erythematous mucosa of the hard palate.

Lichen planus: Microscopic image showing hyperkeratosis, irregular epithelial proliferation in a "saw-tooth" pattern, and a dense band-like infiltrate of lymphocytes underneath the epithelium.

Lichen planus: Striations and erythematous mucosa on the left alveolar ridge and hard palate.

Lichen planus: Microscopic image showing hyperkeratosis, elongation of the rete ridges, and a dense infiltrate of lymphocytes underneath the epithelium.

Lichen planus: Microscopic image demonstrating hyperkeratosis, elongation of the rete ridges and a dense band of lymphocytes underneath the epithelium.

planus: White striations on the left buccal mucosa.

Lichen planus: High power microscopic image demonstrating necrosis of keratinocytes in the basal cell layer and the dense infiltrate of lymphocytes underneath the epithelium.

Lichen planus: Microscopic image showing hyperkeratosis, irregular elongation of rete ridges producing a "sawtooth pattern," and a dense lymphocytic infiltrate underneath the epithelium.

Lichen planus: Epithelium-connective tissue interface showing necrosis of basal cells and replacement by an eosinophilic band.

Lichen planus: Striations and erythematous mucosa on the right buccal mucosa.

Lichen planus: Striations and erythematous mucosa on the right buccal mucosa.

Lichen planus: Striations, white plaques, and erythematous mucosa on the left buccal mucosa.

Lichen planus. White rough lesions forming a network or striated pattern with an underlying red mucosal base, present on the buccal mucosa.

Lichen planus. White rough lesions forming a network or striated pattern with an underlying red mucosal base, present on the buccal mucosa.

Lichen planus. White rough lesions forming a striated pattern on the buccal mucosa and dorsum of tongue.

Lichen planus. Lichen planus. White rough lesions forming a striated pattern on the buccal mucosa.

Lichen planus. White rough lesions forming a network or striated pattern with an underlying red mucosal base, present on the buccal mucosa.