Typically the first sign of a bed bug infestation starts with small, painless bites on your body that usual appear in a trail pattern. Small, hard, swollen, white welt may develop at the site of each bite. This is accompanied by severe itching that lasts for several hours to days. Bed bugs are active mainly at night and usually bite people while they are sleeping. If you wake up with itchy areas you didn’t have when you went to sleep, you may have bedbugs. You may also identify a problem by seeing the actual bug itself, although they are excellent at hiding.