What is the largest organ in the human body? Hint: it is not in the body, but covers it completely. When most think of an organ, skin does not first come to mind, but it is indeed an organ, and like all organs, its health is crucial to our overall well-being. However, skin health is easy to overlook because this complex part of the body has unique structures, functions, and needs. Medical professionals and general audiences may enjoy this free dermatology course, available from Novosibirsk State University through the Coursera platform. Taught by dermatologist Irina Sergeeva, this free five-week course will introduce users to skin health. The material covered in the course includes topics such as skin structures and functions, the environment's effects on skin, skin at different ages, inflammatory skin diseases, and skin infections. The course, which is appropriate for experts and beginners alike, allows learners to "take a trip to the skin," and explore the field of dermatology. On the page linked above, visitors may review the "Syllabus," find "Reviews" of the course, explore "Enrollment Options," and read an "FAQ" before enrolling.