Answer:
Frequent and thorough hand washing and foot care is a good way to prevent germ or fungus buildup. Nails that become too long and/or are rough and torn can scratch and cut an individual's skin and may result in a local infection.
I would say all of the above, because all of those seem to be true
-hope it helps :3
-Stress
-PTSD mental disability (if they saw something disturbing)
-They could be injured (a telephone pole hit em, etc.
-They could not have sufficient nutrition sometimes (shortage of food)
-They would be in shortage in water so that is a big problem because they wouldn't be getting their daily amount of water intake (8 cups)
