Can I still exercise with a blood blister on my foot?

The winter season is gone, so I decided to get back into walking. I walk on a treadmill because we have been having low temperatures for this time of year. After a 30 minute session, I noticed I have a small blood blister on the bottom of one of my feet. When I wear my normal shoes I have no problems whatsoever, but it’s when I wear my slippers and work out shoes. I know why it’s there but I was just wondering if it’s ok to continue working out or try to let it heal?