Actually encountered:

-Twisted ankles.
-Small second degree burn
-allergic reactions
-dehydration (lots)
-heat exhaustion
-blisters
-bug bites
-colds/flu
-lacerations (usually small)
-abrasions

The real problem that I had with the burn and the lacerations is the bandage changes that go along with keeping the wounds clean and dry, particularly when they are on hands. Went though a lot of supplies that way.