No, fleas don’t usually buy in a pattern of threes, but there may be several bites in the same area or in a linear line along the skin. They is especially common along the waistline where the flea may attach itself to a piece of clothing which borders access to open skin.
There is no rule of thumb, however, that a flea bite comes in twos or threes are anything like this. You may get only a single flea bite, or you may be bitten all over the place.
A flea bite usually appears as a raised red bump similar to a mosquito bite, and has a circular puncture wound in the center.
They commonly appear around the legs and feet of a person because fleas are residing on the ground and that is the closest access point. They also frequent the midsection where they attach themselves to the elastic bands around the waistline, but may appear anywhere on the body including the face.