I had a vein in my thigh injected around 4 weeks ago and it is still painful, lumpy, and has just developed what appears to be a clot beneath the skin surface at the injection site. I am aware superficial thrombophelbitis is a complication with injection into larger veins and have been wearing a compression stocking. I walk, but it hurts to sit or kneel as the vein feels tight. I have no follow-up appointment arranged, but am wondering whether I should phone the hospital for a possible draining.