A couple of days ago I was sitting in a hot tub outside at night (the house I stayed at is on a lake in Minnesota) and I felt a bite or a sting of some sort on the back of my left shoulder. I instantly felt it but couldn't tell what had caused the pain. Now 2 days later I've noticed it is a red raised bump about 1.5 cm in diameter and it itches. The owners of the house said they have bats that fly around at night. Do you think I could have been bitten by a bat?