Purple Hands with Tingling and Numbness: Differential Diagnosis

Acrocyanosis (purple discoloration) with paresthesia suggests vascular, neurologic, or mixed pathology.

Seven Key Differential Diagnoses

1. Raynaud Phenomenon: Episodic vasospasm → pallor → cyanosis → rubor. Triggered by cold/stress. Primary (benign) vs. Secondary (scleroderma, SLE, mixed connective tissue disease). Numbness/tingling during ischemic phase.
2. Peripheral Neuropathy: Symmetric stocking-glove numbness, tingling, burning. Causes: diabetes (most common), B12 deficiency, alcohol, chemotherapy, hypothyroidism, vasculitis. Color changes less typical unless autonomic involvement.
3. Carpal Tunnel Syndrome (CTS): Median nerve compression at wrist. Numbness/tingling in thumb, index, middle, radial half of ring finger. Night waking. Thenar wasting late. Color usually normal.
4. Acute Arterial Occlusion (Thrombosis/Embolism): Sudden pain, pallor, pulselessness, paresthesia, paralysis, poikilothermia (6 P's). Purple/blue discoloration = late sign. Emergency.
5. Vasculitis: Inflammatory vessel damage. Polyarteritis nodosa, cryoglobulinemia, ANCA-associated. Palpable purpura, livedo reticularis, mononeuritis multiplex, systemic symptoms.
6. Frostbite: Cold-induced tissue freezing. Numbness, waxy skin, blisters, purple/black discoloration on rewarming. History of cold exposure.
7. Medication Effects: Beta-blockers, ergot derivatives, chemo (vincristine, cisplatin), interferon → Raynaud's or neuropathy.

Urgent Evaluation Needed If:

• Sudden onset, severe pain, pulselessness, paralysis (arterial occlusion).
• Progressive weakness, spreading numbness.
• Systemic symptoms (fever, weight loss, rash).

Workup: History, vascular exam (pulses, ABI), nerve conduction studies, autoantibodies, cold stimulation test, angiography if indicated.