Skin: What’s Under the Hood?

Layers of the Skin

The skin, our body’s largest organ, is made up of three main layers, each with a unique role in protecting and supporting our health. The epidermis is the outermost layer, acting as a barrier against germs, chemicals, and environmental damage. It’s where new skin cells are produced and contains melanin, the pigment that gives skin its color. Beneath this is the dermis, a thicker layer that houses blood vessels, nerves, hair follicles, and sweat glands. This layer provides strength, elasticity, and nourishment to the skin. The deepest layer, the subcutaneous tissue or hypodermis, is mostly fat and connective tissue, serving as insulation and cushioning to protect muscles and bones. Together, these layers keep our skin healthy, resilient, and capable of repairing itself after injury.

Lasers work by delivering focused light energy into the skin, and the depth they reach depends on their wavelength, pulse duration, and energy. In the epidermis, lasers target pigment to treat issues like sunspots, freckles, or superficial scars, breaking down melanin without harming surrounding tissue. Deeper in the dermis, lasers stimulate collagen production, remodel scars, and target hair follicles for removal, using controlled heat to trigger the skin’s natural healing response. Some high-power or long-wavelength lasers can even reach the subcutaneous layer, safely heating fat cells for body contouring without affecting the skin above. By adjusting laser settings, treatments can be customized to address a wide range of skin concerns safely and effectively, from pigmentation and wrinkles to unwanted hair and fat reduction.