Lyme disease is only caused by a minority of tick bites. It is more likely that you will contract the disease if the tick remains attached to your skin for a longer period of time. If the tick is attached for less than 36 to 48 hours, Lyme infection is unlikely.   If you think you've been bitten and are experiencing signs and symptoms of Lyme disease, call your doctor - particularly if you live in an area where Lyme disease is common. Early treatment of Lyme disease is more effective.