dflocust, marlsantos is a spammer. Ignore.

When you say enamel, do you mean oil-based? Many latex paints say they're enamel now, too. I was going to say sand if there's sheen...but in such a tiny area, you'd probably just sand off the paint in all the other areas.

Either way, in such a tiny spot, I'd use an artists paint brush and go over the spot if it bother you that much. I doubt you'll even need to tape.

Jess - thanks for the warning. The white paint is actually interior latex paint, Promar 200. I really don't want to do any sanding. I think I'm just going to paint over the area with a tiny brush (but will use the tape. I'm afraid of my hand slipping.) As I said it's a tiny area, but I'm obsessing over it.