Clods vary in size shape and colour. Some could be described as globules. They represent collections of pigmented cells particularly nests in nevi and melanoma but also in seborrhoeic keratoses. They can also be made up of clumps of melanin, melanophages or pigmented milial cysts or melanin in clumps of basal cell carcinomas where they are characteristically blue clods. In congenital nevi the brown clods are packed together and evenly spaced and sized. In melanomas the brown clods vary in size, shape and colour and are distributed unevenly throughout the lesion but often peripherally Because of their size they pack the papillary dermis and hence are found in dermal net holes rather than on the pigment network lines.
Have a look at the examples below.
