Is there a dermatology website where I can submit photos for a diagnosis?

Dermtube. Its a website for dermatologists. Its similar to you tube.
Contact derm direct. You can contact individual dermatologists via their business websites and ask if they would be willing to help you via photo for diagnosis. But most doctors will not do this because they need to see you in person to make a proper evaluation and diagnosis and recommend treatment.
Not really. While there are sites that have image atlases of dermatological diagnoses, i know of none that will diagnose your condition based on a picture. See your doctor.