What is the study of skin diseases and histology called?

The study of skin diseases and histology is known as dermatology. This field focuses specifically on the diagnosis, treatment, and prevention of skin disorders, along with an understanding of the skin's structure and function at a cellular level. Histology, which is the study of tissue under the microscope, plays a crucial role in dermatology as it allows for the examination of skin samples to identify diseases and conditions.

In the context of skincare and esthetics, while there's some overlap in knowledge regarding skin health, dermatology is a more advanced and specialized discipline that deals explicitly with skin-related medical issues. This is why dermatology is the appropriate term for the study of skin diseases and histology. Other options like pathology, which encompasses the study of diseases in general, do not focus solely on skin conditions, making dermatology the most relevant and correct choice.