PMC5297269_01
(a) Closely set monomorphic follicular papules on anterior and lateral part of neck, (b) Close view showing linear row of papules with a pustule (arrow)
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F1
On examination, the patient had skin-colored multiple discrete and confluent, pin-head sized, monomorphic follicular papules distributed bilaterally on the neck and extending below the supraclavicular margin to involve the anterior upper chest, the posterior upper trunk upto the level of the suprascapular margin, and the proximal upper extremities upto the insertion of the deltoid [Figure 1a]. On close examination, some of the papules were arranged in linear rows across the neck creases and a few pustules were seen interspersed along with the follicular papules [Figure 1b].
(a) Longitudinal section showing mononuclear infiltrate at the infundibulum of hair follicle (arrow), (b) Cross-section showing perifollicular mononuclear infiltrate, (H and E x 100)
IDOJ-8-39-g002.jpg
PMC5297269_01_IDOJ-8-39-g002.jpg
F2
A skin biopsy from a representative papule and pustule, stained with H and E, showed similar findings of a mononuclear infiltrate arranged at the infundibulum of the hair follicle in the longitudinal section [Figure 2a] and a perifollicular infiltrate in the crosssection [Figure 2b], diagnostic of DRIF.