Blood clots. A blood vessel may very well be blocked by an embolus. This is a very small mass of particles that moves with the bloodstream. Or it might be blocked by a thrombus. This is a blood clot. [13] In the tumor like infantile hemangioma the mass is tender, and https://www.sgvascularctr.com/a-comprehensive-approach-to-lymphoedema-treatment-a-vascular-surgeons-perspective/