Bodymap History

I request that bodymap has a change log feature. 

The use case is that you would want to be able to track a bruise or legion from one visit to the next. So bodymap of date 01/01/2018 created with the bruise, then on visit of 01/02/2018 create new bodymap to track bruise and be able to see the bodymap of the 01/01/2017 to you can see the difference.