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Spot size is the diameter of the laser beam at the skin surface. Larger spots penetrate deeper and treat faster but need more energy; smaller spots are more precise. It directly affects both speed and clinical depth.
Spot size is simply how wide the laser beam is where it meets the skin, usually given in millimetres. It is easy to overlook next to wavelength and fluence, but it has a real effect on outcomes.
A larger spot does two useful things: it covers more area per pulse (faster treatments, important for large zones like legs or backs), and because of how light scatters in tissue, it effectively penetrates deeper at the same fluence. A smaller spot trades that depth and speed for precision around delicate or contoured areas. This is why operators step down to a small handpiece for the upper lip and up to a large one for the back.
When assessing a device, look at the range of interchangeable spot sizes and how quickly fluence recovers between large-spot pulses—both shape real-world throughput in a busy clinic.
A bigger spot is not just faster—it reaches deeper, which is why operators size the handpiece to the job.
Spot size is the diameter of a laser beam at the skin—larger spots treat faster and penetrate deeper, smaller spots offer precision. Understanding spot size helps clinics evaluate laser handpieces and treatment throughput.
