Squamous cells are flat, scale-like cells that make up the outer layer of the skin and line various organs in the body. They play a crucial role in protecting underlying tissues from damage, pathogens, and dehydration. These cells are part of the epithelial tissue, which serves as a barrier and is involved in absorption and secretion. In addition to the skin, squamous cells are found in the lining of the mouth, esophagus, and lungs. When squamous cells become abnormal, they can lead to conditions such as squamous cell carcinoma, a type of skin cancer. Regular monitoring and early detection are important for maintaining health.