Apparently I have Witbane, although I don’t remember contracting it. Last time I got a disease, I was only informed of it because a random passerby on the road offered to cure it for me. Wandering the countryside in hopes of a benevolent priest is obviously not a reliable way to go about curing this and future diseases.
How can I cure this disease?
Receive any blessing from any God in a Temple, and you get all diseases cured. Examples are the Shrine of Talos and the Temple of Kynareth ((Whiterun)