Symptoms of Skin Cancer

5. Keratoacanthomas

Keratoacanthomas are considered to be benign, self-limited skin tumors. However, they look very similar to malignant cancers to the naked eye and even under the microscope, so it is difficult to differentiate them. These dome-shaped tumors show up on sun-exposed skin. They start out growing quickly, then slow down significantly. Some shrink and go away on their own without treatment, but some continue to grow and spread. Because they look similar to cancer tumors, most doctors treat them as squamous cell cancer.