Final answer:
Squamous cell carcinoma is characterized by scaly red or pink papules or nodules and is the second most common type of skin cancer, which can often be surgically removed due to its localized nature.
Step-by-step explanation:
A characteristic of the form of skin cancer called squamous cell carcinoma is c. scaly red or pink papules or nodules. Squamous cell carcinoma affects the keratinocytes of the stratum spinosum in the epidermis and often presents as lesions on sun-exposed areas such as the scalp, ears, and hands. It is considered the second most common skin cancer and can be more aggressive than basal cell carcinoma; however, it is typically localized and doesn't frequently metastasize, making surgical removal an effective treatment.
These lesions may appear as firm nodules or flat lesions with a scaly or crusty surface. Squamous cell carcinoma is distinct from melanoma, which is characterized by asymmetrical brown and black patches with uneven borders and a raised surface. Understanding the distinctive appearances can aid in early detection and treatment.