Understand the technology before the brand name

This is a mixed group of devices used on the body. They may cool or heat tissue, deliver focused energy, or stimulate muscle contractions. A brand name does not tell you which mechanism is being used, so start by identifying the technology and its intended purpose.

Imaging systems record standardised photographs or surface measurements. They can help document appearance over time, but an image-analysis score is not a diagnosis and does not decide whether a cosmetic procedure is appropriate.

Laser is a family of technologies, not one treatment. Different wavelengths, pulse patterns and delivery methods interact with different targets in skin or hair. The exact laser, settings, skin type and operator matter more than the word ‘laser’ alone.

LED systems expose skin to non-ionising light at selected wavelengths. They are different from lasers and intense pulsed light: the light is lower intensity, spread over an area and usually does not heat or remove tissue in the same way.

Intense pulsed light (IPL) and branded broadband-light systems use filtered, broad-spectrum flashes rather than a single laser wavelength. Filters and settings determine which parts of the spectrum reach the skin.

Automated needling devices move fine needles into the skin at controlled depths. They are mechanical devices; radiofrequency microneedling is a separate category because it also delivers energy through or around the needles.

Radiofrequency (RF) devices use electrical energy to generate controlled heat in tissue. Some work from the skin surface; others deliver energy through needles. Renuvion uses a distinct helium-plasma and RF system and is included here because of the internal taxonomy, not because it is interchangeable with surface RF.

Hydradermabrasion systems combine fluid delivery, suction and a shaped tip to cleanse and exfoliate the skin surface. Optional solutions or attachments vary, so the name of a facial does not by itself describe every product applied.

Thermal-mechanical systems use a heated tip rather than laser light or radiofrequency current. The tip briefly contacts the skin in a pattern, creating controlled zones of thermal effect.

Aesthetic focused-ultrasound systems concentrate acoustic energy at selected depths below the skin. They are different from diagnostic ultrasound, although one platform may use imaging to visualise tissue before energy delivery.