I have a finished/conditioned basement, drywall on sides (?insulated also). There is a small, silly, maybe 150 sq ft door-ed off unfinished room. This tiny room isn't conditioned. The house is 70 F, 35% humidity; the tiny room is high 50's, but also high 50's humidity.

I read that ideal humidity should be <50 to prevent mold/etc. Should I be worried about this little room? It's not like i see any mold on the concrete or rafters. Should I add a small supply to it or do something just in case?