Sum maryLigneous conjunctivitis is a rare form of idiopathic membranous conjunctivitis. It occurs with type 1 plasminogen deficiency and is characterized by development of firm, fibrin-rich, woody-like, recurrent pseudomembranous lesions mainly on the tarsal conjunctiva. It may occur in other mucous membranes including oral cavity, tracheobronchial tree and upper gastrointestinal tract in addition to the conjunctiva. Due to plasminogen deficiency there is a defect in destruction of fibrin plaque which develops on the damaged mucosa as a result of minor trauma. Although autosomal recessive inheritence is described, most of the cases are sporadic. Generally, it develops during infancy and childhood, but can occur at any age. A 4 year-old male infant presented to the Opthalmology department with pink-red membranous lesion on his left eye extending from the conjunctiva to the iris. Histopathologic evaluation of the excised material was compatible with ligneous conjunctivitis and the diagnosis was confirmed with significantly decreased level of plasminogen in the patient. Despite topical prednisolone and cyclosporin treatment the lesion recurred. The patient was consulted with a hematologist and systemic and topical fresh frozen plasma (FFP) were administered. The case was discussed in terms of its histopathologic features and good response to FFP treatment in company with the literature. (Turk Arch Ped 2012; 47: 131-3)