Inflammatory Skin Disorders · Pathology

Which of the following histological features distinguishes Seborrheic Dermatitis from Psoriasis?

  1. Absent rete ridges and suprapapillary plate thinning
  2. 'Follicular shunting' and parakeratosis at follicular ostia
  3. Total absence of neutrophilic exocytosis
  4. Deep dermal lymphocytic vasculitis
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Correct answer: 'Follicular shunting' and parakeratosis at follicular ostia

Seborrheic dermatitis often shows 'greasy' scales clinically. Histologically, parakeratosis is frequently found at the edges of hair follicle openings (follicular shunting), helping to differentiate it from the regular parakeratosis of psoriasis.

Difficulty: Medium Question 10 of 20

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