Phlebitis is a inflammation of a vein wall or tissues around the vein, is that right?

Phlebitis: Phlebitis is usually inflammation of the vein. It can be associated with clotting (thrombosis) and usually happens in the legs, but it is also common at IV sites.

Phlebitis: yes this is an inflammatory reaction as blood is trapped inside the vein

See vein specialist.: Superficial phlebitis or thrombophlebitis is a clot in a superficial vein and can occur with or without varicose veins. The clot usually is hard and tender. The surrounding tissue is normal. Most superficial phlebitis is treated with localized wet heat and ibuprofen. There is a small risk that this clot can extend into other veins. You should see a vein specialist for an evaluation.