School might matter a bit, derm is tough to get in to. I would say the bigger name the better, Harvard, Yale, JHU, etc. If you can't get in to a top school then just go anywhere and do well. School doesn't matter as much as you may think. If you do well in school, do very good on the boards, do some derm research, make some good connections, and get really good letters from well-known derms you will get in. Easier said than done, but people do it every year, someone has got to get into derm residencies so go for it! Good Luck.