Just because you are itching does not mean it was bed bugs. Especially with it being warmer outside, it could be mosquitoes, flies, spiders, etc…
Bed bug bites can take minutes, hours or even days to show up. The flat, red welts generally won’t itch at first, but will with time and some people don’t have reactions to bed bug bites at all.
When bed bugs bite, you often see clusters of bites. Each cluster usually contains 3 to 5 bites that appear in a zigzag pattern.
*American Academy of Dermatology
