Have painless movable very small lumps front bottom inside of mouth some same skin colour some slightly white. Been about a week no change in size

The good news.. ..is that they are movable and painless. The white part is not so good...that may be something called leukoplakia, often related to smoking. If you smoke, most important thing is to stop. You should be concerned about lumps in your mouth if they enlarge, bleed, last longer than 1-2 weeks, are painful. So you can continue to watch them another week, and if they persist, see dentist/oral specialist.