It commonly happens when one wanders through the woods. At least I assume it is a common occurrence. I do not remember wandering the woods before joining the Wardens.

[Justice takes the soap and works it into a lather between his palms before drawing his fingers through Anders' hair. He works first on his scalp, then down to the tips of his hair, seeing to it that the soap has worked through before returning to his scalp to massage away most of the caked on dirt.]

I have enjoyed this city so far. It seems to be much more pleasant than Olympia.