Blue Nevus

Diagnosis: Blue Nevus

Blue nodule on scalp.

Clinical Presentation

Blue nodule on scalp.

Clinical History

Submitted by Alaa Saad. Originally posted September 28, 2010.

Treatment

See case discussion.

Differential Diagnosis

• Melanoma (nodular) • Dermatofibroma • Tattoo reaction • Vascular malformation • Pigmented basal cell carcinoma

Key Learnings

• Benign melanocytic proliferation in mid-deep dermis — Tyndall effect gives blue color • Two types: common blue nevus (small) and cellular blue nevus (larger, buttock/sacrum) • Dermoscopy: homogeneous steel-blue structureless pattern • Cellular type has higher risk of malignant transformation

Tags: blue, nevus, alaa saad