I bumped head a week ago, didn't have concussion symptoms but it's sporadically sensitive to touch. Small bump that reduced but I'm concerned.?

Subgaleal hematoma. You probably have a small subgaleal hematoma. These collections are beneath the muscle layer of the scalp. They may take quite a while to resolve, but are not something to worry about.
Goose egg. You likely bruised your scalp and experienced some subcutaneous bleeding. Unlikely a brain issue. Should clear over next several days.