1. Symmetric radial streaming
Focal radial streaming
Radial streaming

2. Pseudopods / streaks
 Finger-like projections of
dark pigment at the
periphery of a lesion
 May have small knobs at
the tip
 Histologically represent
confluent junctional nests
of melanocytes

3. Confluent junctional nests of
melanocytes of varying sizes and
shapes in a melanoma
from Menzies et al. 2003 An atlas of surface microscopy of pigmented skin lesions

4. Pseudopods

5. Blue-White (Veil)
 An irregular indistinct
whitish film
superimposed on an area
of diffuse blue pigment
 If overlying the raised
portion of the lesion it
represents dermal
melanin in combination
with compact
orthokeratosis

6. Compact orthokeratosis and dermal melanin

7. Blue-white veil

8. Regression
May occur in:
 Melanocytic lesions
 Solar lentigines
 Seborrheic keratoses
 Actinic keratoses

9. Regression characterized by:
 Well localized blue-gray dots
or granules
 Diffuse multiple blue-gray
dots or granules on a
background of hypomelanosis
 Histologically represents
melanin and fibrosis in the
papillary dermis