Why a book on cutaneous vascular proliferations? There are several compelling reasons to justify the existence of a book on this topic. One of the most important is that cutaneous vascular proliferations are exceedingly common and affect a large number of individuals of both sexes and within a wide age range. They make up a broad spectrum of lesions with morphological and biological variations, ranging from hamartomas to highly malignant, aggressive neoplasms. Although the diagnosis of some vascular lesions is straightforward, many entities pose significant problems in diagnosis, classification, and treatment.