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13-Year-Old Boy with Hyperpigmented Rash

Signs and Symptoms
This patient presented with darkened, creased skin in his neck folds.

How would you diagnose this patient?

Choose one to reveal the diagnosis

Acanthosis nigricans
Addison’s disease
Pellagra
Pseudofolliculitis barbae
Eczema

Answer: Acanthosis nigricans

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