Blue-white veil:

 

A blue-white veil will often only be seen focally within a melanoma rather than the whole lesion. The veil represents thickening of the stratum corneum (compact orthokeratosis) overlying heavily pigmented cells in the epidermis and dermis.

 

 

 

 

 

 

 

 

 

 

 

 

 

Negative network:

 

A negative network or 'inverse' network is essentially the opposite the normal network with the network lines being white rather than brown. Histopathologically it is thought to represent large junctional nests in the papillary dermis with relative elongation of the rete ridges.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Chrysallis structures:

 

These structures are only really seen with polarising dermoscopy. They are white linear structures that represent dermal scarring or remodelling. They are seen in melanomas, BCC as some dermatofibromas.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Milia-like cysts:

 

These white/yellow structures represent intraepithelial clumps of keratin (horn pseudocysts). They are found most classically in seborrhoeic keratoses but can also be found in BCCs, naevi and melanomas.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fingerprint-like structures:

 

As the name suggests, these structures are look like fingerprints and are formed from the lines of ridges. They are found in solar lentigenes or flat seborrhoeic warts.  

 

Comedo-like openings:

 

These are keratin-filled sulci found on the surface of seborrhoeic keratoses or some congenital naevi.