In many cases, potential skin cancers will turn out to be benign. If it isn't caught early on, there's the chance that it's a malignant melanoma or another type of aggressive growth on the skin. When you're dealing with a skin cancer that's started to spread to other areas of the body, your dermatologist will develop a treatment plan to try and get ahead of the cancer's development.
The seriousness of a skin cancer is really dependent on when you catch it. Finding a potential skin cancer in its early stages can be harmless, but this can change if it's left to grow for years. A skin cancer dermatologist will have no trouble spotting this for you before it ever becomes an issue, but it's up to you to take action and ensure your skin and well-being stay protected.