cyanosis: a bluish discoloration of the skin and mucous membranes; a sign that oxygen in the blood is dangerously diminished (as in carbon monoxide poisoning)
symptom: (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
lymphogranuloma venereum: infectious disease caused by a species of chlamydia bacterium; transmitted by sexual contact; characterized by genital lesions and swelling of lymph nodes in the groin