Coexistence of severe peripheral ulcerative keratitis and lichen planus: case report

Introduction and importance: Ocular involvement in lichen planus is highly uncommon, primarily affecting the eyelids, conjunctiva, and less frequently, the cornea. Peripheral ulcerative keratitis (PUK), a rare subtype form of corneal lichen planus, has been reported only once in the literature. Case presentation: The authors report details of a 34-year-old man with confirmed cutaneous lichen planus who developed severe PUK, a rare ocular manifestation of lichen planus. Despite initial worsening with corticosteroids, successful resolution of PUK was achieved with topical Cyclosporin and azathioprine over 2 months but with a final visual acuity limited to light perception. Clinical discussion: To the best of our knowledge, very rare cases have been reported of the coexistence of severe PUK and lichen planus. Lichen planus should be considered in any case of PUKs associated with cutaneous-mucosal manifestations cyclosporin and azathioprine are crucial for effective management and favorable outcomes in such cases. Conclusion: This case aims to show the importance of dermatological examination in the presence of any peripheral ulcerative keratitis. It also sheds light on the therapeutic difficulties and the prognosis of this rare form of ocular lichen planus.