My area is surgery, however, Fitzpatrick's Color Atlas & Synopsis of Clinical Dermatology absolutely fascinates me! The full-color photographs are excellent and there are hundreds of them. I purchased this book as a guide and because I find it so interesting. I don't know how useful it would be to someone specializing in dermatology but I still think it would be worth a look.

http://www.amazon.com/exec/obidos/tg/detail/-/0071440194/qid=1116769881/sr=8-2/ref=pd_csp_2/002-7412153-9396803?v=glance&s=books&n=507846