There is not a lot of physical danger in the life of a dermatologist. A tanorexic could attack you if you mention that they should limit their visits to the tanning bed. In fact, a study conducted by UT Southwestern showed that the brain activity in someone tanning in a UV ray tanning bed is similar to that of someone who is addicted to drugs or alcohol. Tanning beds cause rewarding effects in the brain, so people continue to use them. Getting someone to stop cold turkey might induce a violent or depressed reaction.
You don't really have to worry about dodging shrapnel from a massive zit explosion, either. Actually, Shmoop challenges you to look up the biggest zit in the world and still hold onto your lunch. You are already on the road to being a dermatologist if you can do it.