Homogenous blue pattern
From dermoscopedia
Homogenous blue pattern (structureless blue) is characterized by the presence of blue color with the absence of other dermoscopic structures throughout the entire lesion (Kittler et al., 2016a). Histologically, it corresponds to densely pigmented melanocytes or melanophages in the dermis. Dermoscopic differential diagnosis is broad and includes blue nevi, combined nevi, areas of extensive regression, pigmented nodular melanoma, primary or metastatic melanoma, BCC and radiation tattoos (Scope et al., 2006; Woltsche et al., 2017).