But why are the descriptions so long?

Use of appropriate terminology and important clues, such as configuration and skin distribution, effectively paints an accurate picture for the listener. Use of vague terms—spot, bump, rash, and lesion—is not helpful. Such vocabulary is counterproductive to formulating an accurate differential diagnoses. “Grouped vesicles on an erythematous base” immediately suggests herpes simplex, and “brown, friable ‘stuck-on’ papules” accurately describes seborrheic keratoses. “Well-demarcated, erythematous plaques with micaceous, silvery scales located on extensor surfaces” is suggestive of psoriasis. “Violaceous, polygonal papules with Wickham’s striae located on flexural surfaces” is consistent with lichen planus. On the other hand, “red, scaly rash on the foot” describes an enormous, nebulous group of disorders.