Can suggestion change memories? I came up with this question because of my personal experience. I think it may help you understand my question better, so I will describe it briefly.

Piece of metal

When I was a kid, I (accidentally) watched a horror movie. There was a scene, in which one of characters was using a fork to take out small piece of metal from his body. It scared me very much.

After 15 years, I watched this horror again (and again - accidentally). I was very surprised that, when watching above scene, the small piece of metal was much, much smaller then I remembered. I estimate, that in reality it was about 3x smaller.

Conclusion

Until this experience, I though that memory is somehow 'fixed' since remembered. Was there any research conducted that would prove that memories are not fixed, not constant? It seems like feeling of fear somehow scaled up the source of fear (piece of metal) in my memory image, or some parts of memorised image grew with me. It was like my memory was 'updated'.

If memories are indid 'mutable' by experiences, the obvious question comes to mind - can suggestion influence or even change memories?
The answer to your question is yes, our memories are very malleable. Look into the research of Elizabeth Loftus. She is kind of the pioneer on this topic and has done a ton of research into false memories.

Here is a TED talk by her that you might find interesting and here is a review article