Blood clot. Often a clot can variety inside a hemorrhoid. This is known as a thrombosed hemorrhoid. While not harmful, it may be really painful and at times should be drained. Before sclerotherapy, You may have an ultrasound check with the legs When the veins are triggering symptoms. 初级医疗护理专业人员可能建议您去看专门诊治静脉状况的医生（即静脉科医生或血管外科医生）或治疗皮肤状况的... https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/