The Brown and Black rule: A simple clue to differentiate common naevi from spitzoid neoplasms with a dermoscopic uniform globular (clod) pattern

It is well documented that most dermoscopic colours and patterns of melanocytic naevi correspond to specific histopathological substrates.1 The most common chromophore in melanocytic naevi is melanin, which gives rise to black, brown, grey and blue colour when located in the upper epidermis, dermo‐epidermal junction, upper dermis, and deep dermis respectively.1 Among the four most common pattern of naevi are the network (pigmented crossing lines), globular (clods), starburst (peripheral lines) and structureless blue pattern.1-3