The Warpriest class gets a daily utility at 5th/6th level that cures everything but death (Holy Cleansing).
There is a skill-crystal-thing that I can't remember the name of, it gives you training in a skill for an encounter. That might give them limited access to the Heal skill.
I'm assuming that you are the GM? If so, make an adventure of it: there is a local herb that will slow/heal the afflictions, but they will need a lot of it. When the character go to harvest it, turns out it's already been harvested! Find out who did it, see how much of the herb you can recover... if you don't have enough, who do you choose to heal?
What level/classes are the characters?