Rashes from chigger bites are not contagious because the chigger must bite the person for the rash to form. Chiggers are the tiny red larvae of a mite. They are found in wooded areas, tall grass and other outdoor areas around the world, as described by MedlinePlus.
Most chigger bites occur near the ankle area and cause tiny bumps that resemble pimples. If multiple chigger bites occur in the same area, the bites are exposed to the sun or the victim is allergic to chiggers, a rash may appear. The area affected by the chigger bites is usually itchy.