Final answer:
Ralph is seeking a subspecialty in Dermatologic Oncology, combining dermatology and oncology to focus on skin cancers and related conditions.
Step-by-step explanation:
Ralph is completing a residency in dermatology but wishes to specialize in cancer. The type of subspecialty Ralph is seeking is Dermatologic Oncology. Dermatologic oncology is a specialized field that combines the expertise of dermatology with oncology, which is the study and treatment of cancers.
In this subspecialty, physicians focus on the accurate diagnosis and appropriate treatment of skin cancers, as well as the management of other skin conditions that may be related to cancer or its treatment. This is distinct from general dermatology, which may also include treatments such as Botox injections, laser treatments, and cosmetic procedures. Dermatalogic oncologists require additional, specialized training after their dermatology residency to become experts in this field.