Lymphogranuloma venereum (LGV) is a rare STD caused by a type of Chlamydia. It can scar the genitals and colon, and can swell and burst the lymph glands. LGV has been more common in Southeast Asia and Africa, but because of an increased number of cases appearing in Europe and America, health professionals are concerned. Men are more commonly infected than women, and those reporting homosexual activity are more likely to contract the STD than heterosexuals. The disease is treatable, by means of a three week course of antibiotics.