Stress
Dermatology is a stressful field compared to the life of a musician, for example (a successful one who isn't constantly starving); however, most are able to keep regular hours. At the very least, you won't have to run to the hospital every night to perform an emergency mole removal.
In fact, many people get into dermatology because it allows them the freedom to keep a regular schedule, and to spend time with their families. If you do get stressed out, it's important to manage your stress and maintain a professional demeanor. No injecting a patient's nose with Botox just because you think it'll look funny.