My daughter has many bumps on her knees, elbow and the outside of legs. no fever though any clue? some big some small some with white.heads.

See a doc: Skin lesions like you're describing are notoriously difficult to diagnose without actually seeing and touching them. You should take her to her pediatrician or a family doc to be properly evaluated.

Molluscum?: Hard to say without seeing it but from what you're describing it sounds like something called molluscum contagiosum, which is caused by a benign skin virus. There are treatments for this but often it resolves on it's own. Take her to your pediatrician or a dermatologist to confirm the diagnosis.