Can't, they will probably tell me I have skin cancer. Questionable spots on back from years of sun exposure.
I was a lifeguard and person who took every opportunity in the 70s and 80s to get tan. That said, I've had a few skin lesions removed (I also thought they were scary), with all but one being benign. The other was just barely considered a squamous cell carcinoma.
Doctor removed the lesion in his office and the only other treatment was a topical cream. Most "spots" are easily treatable even if the are cancerous. Problems arise as you do nothing year after year. Just for the peace of mind, spend the money to get checked out by a good dermatologist. Unlike a colonoscopy, it's non invasive and, relatively, painless. You probably have nothing.