To which layer of the skin can UVA rays penetrate?

UVA rays are known for their ability to penetrate deeply into the skin compared to other types of ultraviolet radiation. They can reach the dermis, which is the second layer of the skin located beneath the epidermis. The dermis contains connective tissue, blood vessels, nerves, and hair follicles, making it crucial for skin health and elasticity.

While the stratum corneum is the outermost layer of the skin, made up of dead skin cells, UVA rays do not significantly affect it. Similarly, although they do penetrate the epidermis, their most significant impact is felt deeper in the dermis layer where they can cause long-term skin damage, such as premature aging and an increased risk of skin cancer. The hypodermis, which is primarily composed of fat and connective tissues, is even deeper and not directly affected by UVA rays in terms of penetration, as their primary action occurs in the dermis. Understanding the layers of the skin and how different types of rays interact with them is essential for proper skin protection and care.