Final answer:
Lymphangitis presents as red lines under the skin that are sensitive to touch, caused by inflammation of the lymphatic vessels due to an infection in the lymphatic system.
Step-by-step explanation:
Lymphangitis presents itself as b. Red lines under the skin that are sensitive to touch. This condition is the result of an inflammatory response within the lymphatic system, specifically the inflammation of the lymphatic vessels. These visible red streaks, or lines, under the skin are a telltale sign of lymphangitis and may be accompanied by other symptoms such as warmth and tenderness in the affected area.
When infections occur in the lymphatic system, they not only can cause lymphangitis but may also lead to the swelling of lymph nodes, referred to as lymphadenitis. A swollen lymph node is often referred to as a bubo. In contrast, disorders such as skin infections can lead to several symptoms including edema, which is a severe localized swelling, but this is not specific to lymphangitis.