The formation of a small, red, itchy spot surrounded by a halo may arise at the site of the bite. The severity varies with individual sensitivity and may include some swelling at the site of the bite. Highly sensitive people should seek assistance from a physician. Pets bothered by fleas may create sores on their skin from continual biting and scratching to get at the fleas. So eggs, larva and pupa waiting to continue the cycle are the largest part of the problem.
Fleas are excellent jumpers, leaping vertically up to seven inches and horizontally thirteen inches.
The adult usually remains attached to the host for the rest of its life, about two weeks, unless they are groomed off. Fleas are flat from side to side and can easily move about in the hair of its host. The eggs drop off the animal and hatch on the ground, carpet or animal bedding. Fleas are sensitive to humidity. Eggs hatch in one day to less than two weeks.