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The correct choice highlights a typical presentation of squamous cell carcinoma (SCC), which often manifests as a firm, irregular papule or nodule. This characteristic is related to the nature of squamous cell carcinoma as it involves the keratinocytes in the upper layer of the skin, leading to lesions that can appear raised, rough, and scaly. These nodules may vary in appearance and can be more aggressive than basal cell carcinoma, often requiring surgical intervention.

The other characteristics do not accurately reflect the typical presentation of squamous cell carcinoma. For instance, while SCC can occasionally be painless, many lesions can be tender or cause discomfort, thus the idea that they are completely painless is misleading. Moreover, squamous cell carcinoma can occur in a wide range of age groups, although it is more common in older adults; stating that it is diagnosed primarily in individuals over 60 can overlook cases in younger patients. Lastly, SCC lesions often display variations in color and surface texture due to dysplastic changes and keratinization, contrary to the uniform color that is associated with less malignant lesions.