Um, is it very small like a pimple??? Bulldogs are notorious for getting skin allergies and pimply blackhead things. If it looks like a blackhead, then more than likely it is. Our rescue had one bulldog in that had probably a couple hundred of the blackhead things. They sort of start to come out with washing them, but not always fully, so need a little help. Then we had another, she had them too, but not as bad. Give it a gentle squeeze around the edges.
Whoever said you can't buy happiness, must have never owned a dog!!!!!!!!!!!