I’m glad to hear that that’s not common. From the description GP gave it did not sound like a simple rash.
Obviously I am not saying that people should choose to forego treatment to avoid minor discomfort. I am saying that there are thresholds of quality of life where I think—given both foreknowledge of a treatment’s consequences and emotional distance from the situation—many would choose a shorter, higher quality of life than a longer, drawn out daily battle with little of the things we enjoy.