What is the most likely diagnosis?

Lymphangitis

Lymphangitis-- is an inflammation of the lymphatic channels that occurs as a result of infection at a site distal to the channel. The most common cause of lymphangitis in humans is Streptococcus pyogenes (Group A strep). Lymphangitis is also sometimes called blood poisoning. Signs and symptoms include a deep reddening of the skin, warmth, lymphadenitis, and a raised border around the affected area. The person may also have chills and a high fever along with moderate pain and swelling. A person with lymphangitis should be hospitalized and closely monitored by medical professionals. Thin red lines may be observed running along the course of the lymphatic vessels in the affected area, accompanied by painful enlargement of the nearby lymph nodes