Lyme disease, also known as Lyme borreliosis, is an infectious disease caused by bacteria of the Borrelia type which is spread by ticks. The most common sign of infection is an expanding area of redness on the skin, known as erythema migrans, that begins at the site of a tick bite about a week after it has occurred. The rash is typically neither itchy nor painful. Approximately 25–50% of infected people do not develop a rash. Other early symptoms may include fever, headache and feeling tired. If untreated, symptoms may include loss of the ability to move one or both sides of the face, joint pains, severe headaches with neck stiffness, or heart palpitations, among others. Months to years later, repeated episodes of joint pain and swelling may occur. Occasionally, people develop shooting pains or tingling in their arms and legs. Despite appropriate treatment, about 10 to 20% of people develop joint pains, memory problems, and feel tired for at least six months.
Lyme disease rash is a condition on the skin caused by a bacterial infection carried by deer ticks. The bacteria called Borrelia burgdorferi reaches and infects humans through transmission from tick bites. Lyme disease is the most common tick-borne illness and is more likely to be transmitted to people living in grassy and wooded areas where the carrier ticks dwell. If left untreated however, symptoms can progress from simple classic signs of infection and inflammation to systemic affectation involving the heart and the central nervous system.
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