Detailed answer

Hair and scalp squamous cell carcinoma is primarily caused by long-term exposure to ultraviolet (UV) radiation from the sun or artificial sources. Allergic reactions to skincare products can cause skin irritation, rashes, or inflammation, but they do not lead to the development of squamous cell carcinoma. However, it is important to note that prolonged inflammation or irritation of the skin may increase the risk of developing certain types of skin cancer, including squamous cell carcinoma, especially in individuals with a predisposition or other risk factors. If you experience any persistent skin reactions or concerns, it is recommended to consult a dermatologist for proper evaluation and advice.