Lesion shows hyperkeratosis, acanthosis and mild dysplasia of the basal cell layers. Lamina propria shows actinic degeneration of collagen with subepithelial mild infiltration by lymphocytes and plasma cells. No evidence of malignancy.
Lower lip lesion.
Soft tissue fragment measured 0.8x0.7 cm, totally embedded.
Lower lip lesion, biopsy: