We have blackflies here. They leave a red mark about a centimeter across with a red dot in the middle. Normally they just fade away, but one of our dogs is very sensitive to them--he gets little infections at the bite sites which drain and scab over about 24-48 hours later. So it could be something like that, as well.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."