Results of two recent studies provide new understanding of how and when angiogenesis -- the formation of new blood vessels -- may contribute both to the initial development of rosacea and its persistent presence. In a study of skin samples with and without rosacea, taken from biopsies and evaluated under a microscope, Dr. Amal Gomaa and colleagues at Boston University found evidence of angiogenesis in both the blood and lymphatic circulatory systems in skin with rosacea lesions.¹