Have you crossed a diagnostic threshold for the leading hypothesis, guttate psoriasis? Have you ruled out the active alternatives? Do other tests need to be done to exclude the alternative diagnoses?...

Have you crossed a diagnostic threshold for the leading hypothesis, guttate psoriasis? Have you ruled out the active alternatives? Do other tests need to be done to exclude the alternative diagnoses?

At this point, what is the leading hypothesis, what are the active alternatives, and is there a must not miss diagnosis? Given this differential diagnosis, what tests should be ordered?