@twinmom15 This happened to us. I too always noticed the odor when my S brought home his laundry. After closer inspection you could see the mold on the cinder block walls. As soon as the school was notified, they took appropriate action - cleaned the walls with bleach, set up dehumidifiers etc. He stayed in the same dorm for 2 years. I bought him a humidistat to measure the humidity in his room (after we figured out what was going on). It had an alarm that would sound if it reached a certain level.
Mold is a real issue. I would definitely contact housing as soon as possible. Don’t leave it up to your student. This is serious.