After sclerotherapy patients will often encounter some focal tenderness at the injection sites and along the course of the treated vein. This will feel like a bruise and can last for up to one month after the procedure. Hard lumps are also associated with the sclerotherapy. This may be noted along the course of the treated veins. This is the vein essentially turning into scar tissue and then the body will reabsorb this portion of the vein. Often times a skin discoloration or a bronze stain is noted in areas where veins are close to the surface of the skin. In most instances this is temporary lasting three to four months, however, in a small percentage of patients the staining can be permanent. This is a small risk associated with sclerotherapy.