medical schools all have their standard requirements for undergraduate classes. you can major in pre-med biology or even some of the social sciences as long as you have met the minimum course requirements to apply for admission. four years of college first. four years of medical school next. then you have to find a residency in dermatology and do another 2 or so more years. then you pass the dermatology boards and you are ready to go!
to be a dermatologist do you need a major in health and medicine or in math science technology?