What form of skin cancer begins as skin lesions that appear to be sores that will not heal or sores with a crusted heaped-up look?

The form of skin cancer you are describing is likely squamous cell carcinoma (SCC). It often begins as persistent sores or lesions that may appear crusted or heaped-up, and they can develop on sun-exposed areas of the skin. If left untreated, SCC can grow and potentially metastasize, making early detection and treatment important. Regular skin checks and consultations with a healthcare professional are essential for identifying and addressing suspicious lesions.