I've had a small, scab-like sore on my thigh for 15 to 20 years. I suspect skin cancer.
Skin cancers are the most common form of cancer, and their incidence is climbing dramatically.
People are getting better at spotting skin cancer , though, and that's very good news, because early treatment cures 95 percent of people with the disease. That's why it's important to pay attention to the kind of sore you've described. Any sore that doesn't heal should be examined by a dermatologist. And even though you've had this one for such a long time, it's possible that it may have changed without your noticing. There's really no hard and fast rule for how quickly skin cancers grow.