Bed bug bites may resemble mosquito bites and usually appear in groups. The bites will often be itchy like mosquito bites. It is nearly impossible to tell a mosquito bite from a bed bug bite unless you control the environment and rule out mosquitoes as a possibility. This is why the mere presence of bites is not solid bed bug evidence
While the unsuspecting human is relaxing on their chair, couch, or mattress, the bed bug seeks to suck their blood. After the bed bug is done feeding, they will retreat to digest and lay eggs. The bed bug bites will sometimes continue to bleed for a moment once the bed bug has finished, leaving a small blood stain on bed linens or clothing.
The victim will not usually feel the bed bug bites because they inject an analgesic substance. Like other bloodsuckers, bed bugs use an anticoagulant to prevent the blood from clotting. Evidence of bed bug bites on the skin may not appear immediately, or may not appear at all.