Gangrenous Flesh you’re casting on someone because you want to vend them vast numbers of traumatic wounds (it makes them see a ref after every encounter in which they lost hit points).
Admittedly, both the Spring curses look superficially like they shouldn’t be exorcisable, one of them being ‘you have chronic gangrene and bumblebees love* you’ and the other one being ‘you have a chronic skin condition and all insects love* you’, but if we’ve learned anything from this thread it’s that exorcism is weird.
You can always use Detect Magic to see if someone’s under an enchantment. I’ve successfully exorcised aura RP effects by targeting “The effects of the Night enchantment that the target is under”. I am unsure of how specific one needs to be; while anyone can only be under one enchantment at a time*, so “The effects of the enchantment the target is under” isn’t ambiguous, I’m unsure whether that would be accepted.
*Ish. You can be under RP effects from a personal enchantment and a personal resource enchantment at the same time, although the latter are in general very short term. And who knows, you might need to exorcise the personal resource itself to remove those.
If the exorcism only lasts a day (or an encounter) then that feels quite well-balanced against a curse or ritual which might last an entire year, in my view. Then the liao becomes a way to stave off the effects temporarily, and includes a more significant opportunity cost in the form of needing to get a priest to exorcise you regularly.