Squamous Cell Carcinomas (SCCs)

Squamous Cell Carcinomas (SCCs) stand as the second most prevalent skin cancer type, following closely behind Basal Cell Carcinomas (BCCs). Originating from the skin's squamous layer, situated near the surface, SCCs possess a heightened propensity to infiltrate deeper tissues and potentially metastasize and/or cause local destructive invasion. Predominantly manifesting on the head and neck, SCCs frequently affect the arms and legs as well. Prolonged exposure to ultraviolet radiation, encompassing UVA, UVB, and the notably carcinogenic UVC from welding, remains a primary causative factor. Remarkably, a mere 3 minutes of unprotected welding equates to approximately 3 hours of direct sun exposure. Additionally, substances like tar, lubricants, arsenic-based preservatives, and creosote, prevalent in pest control, have been associated with SCC development.

Clinically, SCCs manifest as elevated, scaly nodules, occasionally tender to touch. On limbs, they might resemble mini-volcanoes with a central depression, sometimes exhibiting a recurrent hard keratin core. Rapid growth over short durations isn't uncommon, while early-stage lesions might mimic eczematous patches.