Everything old is completely again. When my mother was a child, her mother used rags or strips of paper to curl her hair. These days, with the trend towards protecting our hair and looking for gentle and natural styling solutions, paper curls have made a big comeback.
If this does happen, try salvaging the painting by means of gouache or watercolor pencil over that area. It is not ideal and certainly the translucency of watercolor is perplexed. But that is the best/only solution if ought to hap