Wearing a hijab that provides adequate coverage can help protect your skin from direct exposure to the sun's ultraviolet (UV) rays, which are a known risk factor for skin cancer. However, it's important to note that the level of protection can vary based on the fabric's thickness, color, and how well it covers the skin.
While a hijab can provide some protection, it's still advisable to use additional sun protection measures such as sunscreen, sunglasses, and seeking shade when necessary, especially if you're spending extended periods of time outdoors. Regular skin checks and consultations with a healthcare professional are also important for monitoring your skin health.