Like any insect bite, there can be local redness and swelling right where bacteria enter the body. The unique bull's-eye pattern of red and white bands seems to come from the cells of the immune system chasing the fast-moving bacteria. After this first phase they move into other tissues, especially nerves, heart, and joints, causing weakness in the face, swollen joints, or heart problems. Prompt treatment with simple antibiotics within the first several weeks usually clears the infection, although symptoms can linger for months after appropriate treatment. People whose have symptoms longer than six weeks should consider whether they have other infections or illnesses. Blood tests do not always tell the whole story. Making notes about when symptoms come and go helps clinicians and specialists. It can take time and several visits to develop a comprehensive treatment plan.