A glossary of non-surgical aesthetics.

A cell that stores fat. Adipocytes are the direct biological target of cryolipolysis and certain laser-based fat reduction platforms, which trigger their controlled destruction.

A 755 nm laser absorbed efficiently by melanin. Used for laser hair removal on Fitzpatrick I to III skin and for certain pigment correction protocols. Cannot be used on darker skin tones because the surface melanin would also absorb the energy.

Programmed cell death. The biological mechanism by which fat cells are eliminated after cryolipolysis or radiofrequency lipolysis treatment. The cells die over a period of weeks and are cleared metabolically by the lymphatic system.

A tissue target that absorbs a specific wavelength of light. The three primary chromophores in aesthetic laser treatment are melanin (responsible for pigment), hemoglobin (responsible for vascular structures), and water (responsible for general tissue heating).

The selective freezing of subcutaneous fat cells, which crystallize at higher temperatures than the surrounding skin, nerve, and muscle. The crystallized adipocytes undergo apoptosis and are cleared metabolically over the following weeks. CoolSculpting is the best-known cryolipolysis platform.

The layer of skin directly beneath the surface (epidermis), containing collagen, elastin, blood vessels, hair follicles, and sweat glands. Most aesthetic treatments target the dermis or the subdermis below it.

An 810 nm laser, intermediate in penetration between alexandrite (755 nm) and Nd:YAG (1064 nm). Versatile across Fitzpatrick I to IV for laser hair removal.

Designations from the U.S. Food and Drug Administration. FDA-cleared means the device is substantially equivalent to one already on the market (the 510(k) pathway). FDA-approved typically applies to drugs and high-risk devices that have undergone full premarket approval. Most aesthetic devices are FDA-cleared rather than FDA-approved, though the terms are often used interchangeably in marketing.

A six-tier classification of skin type based on response to ultraviolet light, developed by Harvard dermatologist Thomas Fitzpatrick in 1975. Type I burns easily and never tans; type VI is deeply pigmented and rarely burns. The Fitzpatrick scale determines which laser wavelengths are safe and effective for a given individual.

A non-surgical skin tightening modality that delivers ultrasound energy to a precise depth (typically 1.5, 3.0, or 4.5 mm), generating microscopic zones of thermal coagulation that trigger collagen production over the following months. Ultherapy is the best-known focused ultrasound platform.

A laser that delivers energy in a grid of microscopic columns rather than across the entire treatment area, leaving untreated tissue in between to drive faster healing. Fraxel and Clear + Brilliant are fractional laser platforms used for skin rejuvenation.

The in-person, no-cost evaluation offered to every prospective client at Perfect Body Laser & Aesthetics^®. Includes intake, photographic documentation, weight and measurements, lifestyle review, and a written treatment plan tailored to the individual. Approximately one hour. No obligation.

The oxygen-carrying pigment in red blood cells. Hemoglobin is the chromophore targeted by vascular lasers and pulsed dye lasers used to treat broken capillaries, rosacea, port-wine stains, and visible vasculature.

An excess of melanin in the skin, presenting as dark patches. Causes include sun damage, hormonal changes (melasma), and post-inflammatory response. Treated with IPL, picosecond lasers, and professional-grade peels, depending on the underlying cause.

A broad-spectrum light platform that targets both melanin and hemoglobin simultaneously, used for photofacials, sun damage, freckling, and rosacea. Limited to Fitzpatrick I to III due to the risk of post-inflammatory hyperpigmentation in darker skin tones.

The breakdown of fat. In aesthetic treatment, lipolysis refers to non-surgical platforms (laser, radiofrequency, ultrasound) that destroy fat cells through controlled thermal or mechanical injury, distinguished from cryolipolysis which uses cooling rather than heating.

The pigment that gives skin and hair its color. Melanin is the chromophore targeted by laser hair removal platforms and most pigment correction lasers. Its concentration determines an individual's Fitzpatrick skin type and which laser wavelengths can be safely used.

A form of hyperpigmentation, typically on the face, often triggered by hormones, pregnancy, or sun exposure. Notoriously stubborn and easily worsened by aggressive treatment, melasma requires careful platform selection and experienced management. Picosecond lasers, gentle IPL protocols, and topical regimens are commonly used.

A variant of focused ultrasound used in Ultherapy, which delivers ultrasound energy with real-time imaging. The imaging allows the practitioner to visualize the tissue layer being treated, ensuring accurate placement at the SMAS layer of the face and neck.

A radiofrequency delivery method in which energy travels from a single electrode through tissue to a return pad. Penetrates deeper than bipolar or multipolar configurations. Thermage is the best-known monopolar radiofrequency platform.

A laser pulse one billionth of a second long. Used in Q-switched lasers for traditional tattoo removal. Slower and less efficient than picosecond pulses, but well-tolerated for black and dark blue inks.

A 1064 nm laser that penetrates deeply and bypasses surface melanin. The safest laser hair removal wavelength for darker skin tones (Fitzpatrick IV through VI). Also used in Q-switched form for tattoo removal and in long-pulse form for vascular treatment.

A laser treatment that heats the dermis without removing the surface (epidermis) layer. Lower downtime, slower results, and lower risk profile than ablative treatments. Most modern fractional lasers, including Fraxel DUAL and Clear + Brilliant, are non-ablative.

The rapid expansion of tissue caused by extremely short laser pulses, used to shatter tattoo ink particles or stubborn pigment. The mechanism behind picosecond and Q-switched laser tattoo removal.

A skin rejuvenation treatment that uses intense pulsed light or laser energy to address sun damage, freckling, broken capillaries, and rosacea in a single session. Commonly performed in a series of three to five.

A laser pulse one trillionth of a second long, a thousand times faster than a nanosecond pulse. Picosecond technology delivers higher peak power with less surrounding heat, producing more efficient ink shatter and lower risk of pigmentary side effects. PicoSure and PicoWay are the leading picosecond platforms.

A darkening of the skin that follows an inflammatory event, including a poorly executed laser or IPL treatment. The risk rises with Fitzpatrick skin type. Selecting the appropriate wavelength and energy setting is the primary defense against post-inflammatory hyperpigmentation, which is why a multi-platform provider is the safer choice for darker skin tones.

A laser that produces extremely short, high-peak-power pulses in the nanosecond range. The traditional standard for tattoo removal before picosecond technology arrived in the early 2010s. Still effective for black, dark blue, and red inks.

Electromagnetic energy that converts to heat as it passes through tissue, used for skin tightening and fat reduction. Available in monopolar (deepest reach), bipolar (shallow), and multipolar configurations, each appropriate for different concerns.

The principle, articulated by Anderson and Parrish in Science in 1983, that specific wavelengths of light can be tuned to specific tissue chromophores without damaging surrounding structures. The foundational concept underlying nearly every laser treatment in modern aesthetic use.

A non-surgical body treatment that delivers acoustic pressure waves to subcutaneous tissue, used to break down localized fat and improve the appearance of cellulite. Often combined with other body sculpting platforms in a comprehensive plan.

The superficial musculoaponeurotic system, a fibromuscular layer beneath the skin and fat of the face and neck. The SMAS layer is the deep target of focused ultrasound platforms used for non-surgical lifting, the same layer addressed by traditional surgical face-lifts.

The fat-bearing layer beneath the dermis, where most non-surgical body sculpting platforms direct their energy. Cryolipolysis, laser-based fat reduction, and radiofrequency lipolysis all act on subcutaneous adipocytes.

A monopolar radiofrequency platform manufactured by Solta Medical, used for non-surgical skin tightening over larger areas. Latest generation: Thermage FLX. Treats face, neck, and body in a single session.

A monopolar radiofrequency body sculpting platform that delivers therapeutic heat to subcutaneous fat, triggering apoptosis. Used for combined fat reduction and mild skin tightening, typically over the abdomen, flanks, and thighs.

A microfocused ultrasound platform with real-time imaging, used for non-surgical lifting of the face, neck, and brow. The only FDA-cleared device for SMAS-layer lifting without surgery.

The network of visible blood vessels at or near the skin surface, including broken capillaries, spider veins, and the diffuse redness of rosacea. Treated with KTP, Nd:YAG, and dual-wavelength vascular lasers such as Excel V.

The distance between successive peaks of a light or sound wave, measured in nanometers (nm) for laser light. Wavelength determines which tissue chromophore the laser targets and how deeply the energy penetrates. Choosing the right wavelength is the single most important variable in laser treatment selection.