Can a prolonged chalazion cause long-term astigmatism in adults?

My upper left eyelid developed a chalazion five months ago which was causing irregular astigmatism. After several visits with my ophthalmologist, my chalazion has reduced in size and the vision has slightly improved but has not completely resolved. If I continue conservative treatment, how long will it take for the chalazion to resolve and will my left eye develop permanent astigmatism if the lesion stays there longer? I want to avoid minor surgery due to the possibility of having it reoccur.