Primary Dermatologic Nail Disorders - Differential Diagnosis Algorithm

Nail Plate - Pitting

 • Psoriasis

 • Alopecia Areata

Nail Plate - Thickening

 • Psoriasis

 • Onychomycosis

 • Onychogryphosis

Nail Plate - Onycholysis

 • Psoriasis

 • Onychomycosis

Nail Plate Discoloration - White / Yellow-Brown

 • Onychomycosis Green

 • Pseudomonas infection

Nail Plate Discoloration - Brown / Black Linear Streak

 • Junctional/ Melanocytic Nevus

 • Malignant Melanoma Under Nails

 • Drug-Induced

Nail Fold - Inflammation

 • Ingrown Nail

 • Trauma/lnfection - Acute Paronychia

 • Chronic Paronychia

Nail Fold - Telangiectasia

 • SLE

 • Scleroderma

 • Dermatomyositis



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