Description: Grey dots, drafts of rhomboidal structures. The clue to diagnosis is the superficial broken-up network.

History: This patient came for a flat pigmented lesion of the right cheek. It was a bit scaly. The dermoscopic exam showed a pseudo-network, with grey dots, in some places taking the form of rhomboidal structures. The clue to the diagnosis was the superficial tan-brow broken-up network, a sign in favor of a pigmented actinic keratosis. The pathology after a shave biopsy confirmed this hypothesis.

Bibl: Zalaudek I and al "Pitfalls in the clinical and dermoscopic diagnosis of pigmented actinic keratosis" J Am Acad Dermatol 2005;53:1071-1074.