 [ Symptoms ] what can i do to treat food allergies at home [ Disease ] if there is a single isolated area which appears to be bruised it might be a varicose vein of the labia alternatively one can get a bruise in the labia from a small broken blood vessel a bike seat or fall onto bike bar can create bruising if you have easy bleeding e g from shaving cuts bleeding gums etc  even minor trauma can leave bruising  certainly if the involved area appears to be enlarging you should get seen