Is it possibly skin cancer?

So about a month now I have a particular spot in my left side upper back thats been itching me a lot and also has like a muscle achy pain. I went to my GP last week and she said probably just muscle pain and to do some back exercises and prescribed me Triamcinolone Acetonide oinment. As I had my daughter rub the oinment on my back she found a brown spot on my back, when she touched it, it was the exact location where the itching was originating from. I told her to scratch it a bit and I guess the brown spot got removed and it bleed a little bit and became a little ulcerated. I took pictures of the brown bump where it itches badly and I took pictures of it after my daughter had scratched it off. I contacted my GP again and she will refer me to a dermatologist. From the itching, and muslce back ache to the brown spot pictures, can it be skin cancer?