My 3 year old has a painless lump on her lower back, has been there probably over a year. like a bruise in color, skin texture slightly rough.thoughts?

Hard to be sure: A first thought would be a cavernous hemangioma, which is a blood vessel collection. It is deeper but similar in origin to a strawberry mark. However, these are usually grow & become prominent by age 1. I would need to look at it & even then might want some tests. If it is midline over the spine it needs to be evaluated soon as that could be a problem.