A red streak on the skin could indicate a dangerous infection known as lymphangitis, requiring immediate medical attention to prevent complications like abscesses or sepsis. This inflammation of the lymphatic vessels is typically caused by bacterial infections and presents with red, painful streaks on the skin, fever, chills, and swollen lymph nodes. Prompt antibiotic treatment is crucial to prevent the infection from spreading. Symptoms can progress rapidly within 24 hours, leading to sepsis if left untreated. Causes of lymphangitis include skin infections, puncture wounds, bug bites, and surgical wounds. If you notice red streaks or other symptoms, seek medical help promptly.