Thanks for your query at DoctorSpring.com. I can understand your concern. I reviewed the pictures.
This could be bed big bites but it's really difficult to confirm that just by seeing the lesions.
Bed bugs do tend to hide in the seams and could be difficult to find. It would be best to treat the mattresses with appropriate pesticides.
I would recommend an application of cortisone cream mixed with Mupirocin cream twice a day for two weeks on your lesions. You can also take tab. Claritin once daily to take care of the itching.
Please let me know if you have any queries. Take care