Lyme disease is spread by these ticks when they bite the skin, which permits the bacterium to infect the body. Lyme disease is not contagious from an affected person to someone else. Lyme disease can cause abnormalities in the skin, joints, heart, and nervous system. ###>La maladie de Lyme peut causer des anomalies dans la peau, joints, cœur, et le système nerveux.