There was a group of cards just like the Hickman that sold several years ago. It was caused by reaction to the glue and possibly a chemical used to try and remove the glue. I think there is a thread on here about them but I couldn't find it.
There was a different group that was sold together that Jeff's Dahlen came from
here's the thread on some of the cards that were in that group
https://www.net54baseball.com/showth...highlight=Glue