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Image Number 789 (Lichen spinulosus)

 
Morphology:
Papules

Diagnosis: Lichen spinulosus

Site: Elbow

Sex: M

Age: 10

Type: Clinical

Description: Follicular keratotic papules

Submitted by: Shahbaz Janjua

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Differential Diagnosis

History: Lichen spinulosus (LS) is a rare, idiopathic, follicular, keratotic dermatosis occurring mostly in children, adolescents and young adults.  Characterized by an acute development of symmetrically distributed follicular, keratotic papules that are sharply grouped in round to oval plaques varying in size from 2 cm to 6 cm, LS can appear on the extensor surfaces of elbows and knees, the neck, buttocks, abdomen and the trochanteric regions.

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