Bleeding from Superficial Veins – long-standing high pressure in the veins may develop an area that bleeds through small sites, no larger than pinholes. Most of these occur around the ankle, but spontaneous bleeding can also occur anywhere there is high venous pressure
Venous pigmentation, also known as Hemosiderin staining of the skin is a relatively common late complication of untreated superficial venous insufficiency or venous reflux resulting in chronic venous hypertension.
Venous stasis dermatitis, also known as venous eczema, is a common inflammatory skin disease that occurs on the lower extremities in patients with severe chronic venous congestion. It can arise as discrete patches or affect the leg all the way around the ankle. Symptoms of this condition include swelling (typically concentrated around the legs or ankles), changes in skin color and texture, and pain. The affected skin is itchy and assumes red, purple, or brown colors.

venous stasis ulcers is the most serious complication of untreated superficial venous insufficiency and chronic venous congestion.

Superficial venous thrombosis is a blood clot, or thrombus, which develops in a vein close to the surface of the skin. The blood clot commonly appears as a red streak along the course of an affected vein, which may feel warm and tender or swollen due to inflammation (phlebitis).
Deep vein thrombosis (DVT) – occurs when a blood clot forms in the deep veins of the body, usually in the leg. Total occlusion of one or more of the major leg veins and the impaired blood return to the heart results in massive leg swelling.

Pulmonary embolism – blood clot forms in the deep veins of the body some time migrate to lungs vein it may lead to death also if undiagnosed.