They may be as small as a pencil dot, but ticks infected with Lyme disease can make people sick.  The little bugs are found in wooded areas and jump from animals to humans, biting them. The Centers for Disease Control reports the number of Lyme disease cases in the United States has doubled since 1991.     

"93% of all cases occur in 10 states in the United States. So, up in the Northeast, the North Atlantic and the Northwest is where these cases occur," said Dr. Ali Khan from the CDC.     

Dr. Khan says a bull's-eye rash is a symptom for nearly three quarters of patients.   

"Often that rash, the bull's-eye rash, is associated with some fever and some headaches and some muscle aches and a little fatigue," he said.
  
Treatment with antibiotics is most effective if the condition is caught early. Dr. Khan says prevention is key.    

"Wear light colored clothing, long sleeve shirts, long pants, tuck them in, do daily tick checks during the right time of year, if you see ticks remove them," said Dr. Khan.
   
Using bug spray with at least 20 % "deet" can also help prevent infection.