Post-thrombotic syndrome (also called postphlebitic syndrome) is a complication of a blood clot that forms in a deep vein. Post-thrombotic syndrome occurs because of damage to the vein caused by the blood clot (thrombosis).

Post-thrombotic syndrome can be a long-term problem that lasts for years. It can cause sores that are painful and hard to treat.

The symptoms include:

• Pain, discomfort, swelling, or itching.
• Slow-healing sores.
• Brownish discoloration or darkening of the skin.
• Fragile skin on the area, which bruises easily. The skin may be dry and may peel.

Compression stockings may be used to reduce swelling and relieve symptoms.