Could these be bed bug bites?

yesterday morning i woke up with 3 weird bites, above my elbow....today i woke up with another one on my stomach. they're about the size of a dime, round-ish and slightly itchy, with no discernible bite mark. i did a bit of research on bed bugs, and it seems that they bite a lot more than what i've been experiencing. my mother also noticed some, and a tenant of ours mentioned that we might have some several weeks ago, but hasn't complained of it since. i have no idea what they are, or even how to check for bedbugs....any help would be greatly appreciated!!!