Xray of knee found bone lesions. Dr said their not worried just recheck in 6 months. I'm worried tho. Can it be from overweight? Please let me know

Not likely but. We see many things on plain x-rays of the bones. There are many that we are born with or part of our growth, or old injuries. Being overweight causes problems in the joints or may be associated with hidden fractures. Without seeing the images, I cannot really tell what the doctors think it is. If you want a second opinion, I can review the images for you.