Thank you for your question.
Your history of spider veins and the blue spot on your leg can be from venous congestion
caused by varicose veins
A congestion of blood in the leg veins can cause swelling and skin changes in the skin over the legs.
This can be treated by treating the varicose veins.
An Interventional Radiologist
like me can treat this by either an Endovenous Laser Therapy or by Radiofrequency ablation
Both the spider veins and skin patches should disappear after this treatment.
Vascular Interventional Radiologist