The homogeneous pattern appears as a diffuse, brown, gray-blue to gray-black or reddish-black pigmentation in the absence of pigment network or other distinctive local features.

Diagnostic significance

The homogeneous pattern, especially when predominantly of bluish coloration, represents the morphologic hallmark of blue nevus. It may be present, however, also in Clark nevi, dermal nevi, nodular and metastatic melanomas, thrombosed hemangiomas, subungual hematomas and subcorneal hemorrhages. In addition, this pattern may be occasionally found in pigmented basal cell carcinomas and in tattoos.