A person can tell if a bite is from a bed bug by the following:
Bites usually appear on areas of skin exposed while sleeping, such as the face, neck, and arms.
Spots of blood will be visible on a person's bedding. This is from the bites or from squashing the bedbug while sleeping.
Small brown spots will appear on bedding or furniture. This is bedbug poo.
On white skin, bedbug bites usually look red.
On black or brown skin, bed bugs may look purple and may be harder to see.