I had a similar experience. I had a strange mole on the back of my right arm. It started feeling and looking strange. My family members voiced concerns. So I went to my local Clinic where I had always gone and was told it “Didn’t fit the criteria for a Melanoma”. I went home and soon our family dog showed concern… I have never seen a dog look so worried before or since!! It continued… He would “Talk” to me grumbling, etc. and when I would take him with me in the car I could feel his nose bumping on the back of that arm!!! Finally I made an appointment with my parents dermatologist and was diagnosed with Stage 3 Melanoma!!!