Petechiae are small red or purplish flat spots on the skin that don't fade when pressed. Petechiae are due to broken capillaries in the skin. Petechiae without fever can occur in the head and neck after forceful coughing or vomiting. Most children with petechiae and fever have a mild viral illness.Why do you get a rash after a fever?
Several common childhood illnesses, including roseola and scarlet fever, can cause a rash to develop after the fever passes. A fever is not a disease but a sign that the body’s immune system is fighting an infection. The body raises its core temperature to fight off the invading bacteria or viruses.Is it normal to have a rash after a fever?
After about 3 days, the answer usually becomes quite clear as the fever resolves and is followed within a day or so by a telltale roseola rash. By the time the rash appears, children are no longer contagious and can return--rash and all--to normal activities (eg, preschool, mommy-and-me class).