This publication describes a clinical case of spontaneous subconjunctival hemorrhage in a 15-year-old child on the background of idiopathic local dilatation of epibulbar vessels. Vascular pathology of the orbit and periorbital region is often accompanied by subconjunctival hemorrhages. The aim of the work was to describe a rare clinical case of spontaneous subconjunctival hemorrhage in a child with local idiopathic vasodilation. A complete clinical instrumental study revealed no pathology except the local dilatation of epibulbar vessels. In 6 months after the subconjunctival hemorrhage resorption, the ampoule-shaped expansion of the epibulbar vessels with a wall different from others in color and shape is preserved, which was confirmed by the data of optical coherence tomography (OCT) of the anterior eye segment. When examining patients with spontaneous subconjunctival hemorrhage, especially in childhood, along with pathology of the cardiovascular and circulatory systems, it is necessary to exclude malformations of the vessels of the orbit, periorbital region and anomalies of the epibulbar vessels.