Juvinile deer ticks are the size of the head of a pin and are moslty harmless, but as they get older they get larger.. about the size of a cross section of a uncooked grain of rice. If they at one point in their lives came in contact with a deer, fox, mouse, etc that was infected with Lyme Disease, then you'll be in trouble. I just picked one off of my chest 2 days ago and picked one off of my kid's belly button. Both were large ones..
