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Simple Summary: Skin lesions in the context of MDS/MPN are frequent and poorly understood in the current literature. This paper thoroughly reviews the dermatoses reported so far in these patients based on their relationship with prognosis and its main clinical, histopathological and genetical features. Different histological patterns and mutations have been described in the literature. However, the true nature of the cells in these cutaneous infiltrates as well as their mutational background and the link with the underlying hematological neoplasm have to be further investigate in order to clarify their biological significance and the main therapeutic implications. A classification proposal is developed with the aim of helping dermatologists, hematologists and pathologists to recognize them when present in these complex patients. The figures and tables included in the text and in the supplemental material facilitate the understanding of each of the proposed categories. In addition, the main publications in which these dermatoses have been previously treated are indicated. Myeloid neoplasms and acute leukemias include different entities that have been recently re-classified taking into account molecular and clinicopathological features. The myelodysplastic syndrome/myeloproliferative neoplasm (MDS/MPN) category comprises a heterogeneous group of hybrid neoplastic myeloid diseases characterized by the co-occurrence of clinical and pathological features of both myelodysplastic and myeloproliferative neoplasms. The most frequent entity in this category is chronic myelomonocytic leukemia (CMML) which is, after acute myeloid leukemia (AML), the main myeloid disorder prone to develop cutaneous manifestations. Skin lesions associated with myelodysplastic and myeloproliferative neoplasms include a broad clinical, histopathological and molecular spectrum of lesions, poorly understood and without a clear-cut classification in the current medical literature. The aim of this review is to describe and classify the main clinical, histopathological and molecular patterns of cutaneous lesions in the setting of MDS/MPN in order to improve the diagnostic skills of the dermatologists, hematologists and pathologists who deal with these patients. [ABSTRACT FROM AUTHOR]