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At first glance, pityriasis rosea and guttate dermatosis seem to have more findings histopathologic in common than they have differences. Both have a superficial perivascular infiltrate of lymphocytes predominantly, spongiosis, and parakeratosis. They differ primarily in that pityriasis rosea has a moderately dense infiltrate, extravasated erythrocytes in what may be an edematous papillary dermis, readily […]