Not Medical Advice: Yes! Bed bugs do bite.
Bedbug bites usually cause itchy welts. These welts often appear in a zigzag pattern as show in the photo below.
According to the American Academy of Dermatology, having bite marks on your body is the most common sign of bedbugs. Most people are bitten while they sleep and do not that they have been bitten until the next day when they notice one or more of the following:
Several welts, often appearing in a line that zigzags.
Welts that itch intensely.
Specks of blood on the bedding.
The first time you are bitten, the bites may not itch right away. It can take time for your body to develop a reaction to the bites. Some people develop itchy welts within a few days of the first bites, but it can take as long as 14 days before the bites itch.
Steps to get rid of bed bug infestation according to NYC Department of Health and Mental Hygiene:
Never bring bed frames, mattresses, box springs or upholstered furniture found on the street into your home.
Check all used or rented furniture for bed bugs.
When traveling, inspect the bed and furniture. Keep suitcases off the floor and bed, and inspect them before you leave.
If you suspect you have been around bed bugs, immediately wash and dry your clothing on hot settings or store it in a sealed plastic bag until you can.
Seal cracks and crevices with caulk, even if you don't have bed bugs. This will help prevent bed bugs and other pests from coming in.
Get tips to prevent or control bedbugs at United States Environmental Protection Agency.