You should not worry about this.
The line is formed by the sublingual gland underneath and the little bumps are the multiple ducts opening into the mouth along this line.
This is perfectly normal and is present in everyone.
You can look up here for an image:
http://home.comcast.net/~wnor/lesson10.htmI hope my answer has helped you. Please click on the green 'accept' button below for accepting this answer. Feedback/Bonus will be appreciated.