I found what i think is skin cancer on my leg, can i go to the emergency department or i have to find someplace else?

Not usually emergenc: Skin cancer is almost never an emergency; in fact it has likely been there growing for at least 6 months. Typically you will have a better experience if you make a routine appointment with a surgeon or a dermatologist to see about arranging a biopsy, which will tell if it is cancer or not.

Primary care: The best place to start is with you primary care physician or dermatologist.