Strawberry gingivitis is actually a rare manifestation of an also rare vascular disease, Cram says. The disease, which the woman, in this case, was indeed diagnosed with, is called granulomatosis with polyangiitis. It's a condition that causes inflammation of the blood vessels Hyperplastic gingival lesions or strawberry gingivitis, is a characteristic sign of Wegener's granulomatosis. The latter consists of reddish-purple exophytic gingival swellings with petechial haemorrhages thus resembling strawberries.