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Differentiating Between Primary Acanthosis Nigricans and Postinflammatory Hyperpigmentation

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	Primary Acanthosis Nigricans	Postinflammatory Hyperpigmentation
Breed	Dachshund	Any dog breed
Age of onset	< 1 year	Any age, but usually > 1 year
Pattern	Axillary and/or inguinal areas	Any site, any pattern; can be localized or diffuse
Inflammatory lesions	Absent	Any combination of erythema, scaling, hair loss, lichenification
Secondary infections	Absent	Common
Pruritus	Absent	Common
Skin surface texture	Smooth	Irregular, elevated, lichenified
Concurrent skin disease	Absent	Common