Bed bug bites may show up within hours or days after the bite, depending on an individual's sensitivity. The bites often appear in clusters or lines on exposed skin areas.

The timing of bed bug bites varies based on the person’s allergic response to the bed bug’s saliva. Some people may react immediately, while others might develop visible bites after a few days. Bed bug bites are characterized by red, itchy welts that often appear in rows. Itching and discomfort can be treated with topical creams or antihistamines.