Diagnosing integumentary disorders case study

The prompt asks for four things and they are not equally weighted. A primary diagnosis and three differentials can be produced by anyone with a dermatology reference; explaining the role the patient history and physical exam played in reaching the diagnosis cannot, and that is where the reasoning shows. It is also the requirement most likely to be answered in one vague sentence and then abandoned. Answer it by naming which specific findings moved you toward your primary and away from each differential. In dermatology this is unusually tractable, because the discriminating features are concrete: the distribution of the lesions, their morphology, whether they itch, how long they have been present, what the patient was doing or exposed to beforehand, and whether anyone in the household has the same thing. Each of those is a question you either asked or did not, and the answer shapes the differential.

Structure the differential so each candidate is doing work. For every one you list, say what would make it more likely and what in this case argues against it — a differential with no discriminating feature attached is decoration. Be careful to keep morphology language precise, since macule, papule, plaque, vesicle and scale are not interchangeable and a marker in an advanced assessment course will notice imprecision immediately. Distribution deserves particular attention because it is often decisive: interdigital and flexural involvement, a belt-line distribution, or symmetry versus a single dermatome each point in a different direction. Finish with treatment options based on your diagnosis, and include what you would tell the patient about resolution and recurrence, because a management plan that stops at the prescription leaves out the part that determines whether the treatment works. Patients stop topical treatment when the itch settles, which is usually well before the condition has resolved.