Tenants want pest control without finding bugs

[Winnie C.]

Hi all. I'm a relatively new landlord and I need your help.

My tenants (a couple) moved into my condo in MA a month and a half ago. They just told me they wanted pest control for bedbugs in the unit because one of them kept getting bites since moving in. They said they put their mattress in a protector, cleaning throughout, etc. but the situation didn't improve. They thought it was mosquito bites or allergies initially but it kept getting worse and worse. They haven't seen any bedbugs but they ran out of options.

This is a condo I recently purchased. I had a professional cleaning company clean the entire unit before the tenants moved in.

How should I approach this?