The physics is the same as any pico laser: a pulse short enough that pigment shatters under a pressure wave instead of heating up and cooking the skin around it. What makes PicoSure specific is the 755 nanometer alexandrite wavelength it was built around.
At 755 nm, melanin absorbs strongly, which is why the device does well on brown spots, freckles and the deep dermal pigment of nevus of Ota. That same absorption is a double-edged property: it means the beam is also drawn to the melanin in your ordinary skin, which is why the original 755-only machine needs more caution on brown and Black skin than a 1064 nm device does.
For tattoos, 755 nm is a good match for green and sky-blue inks, which are the ones that defeat older lasers. It is a less efficient choice for dense black ink, where 1064 nm penetrates better. That is the main practical reason Cynosure added 532 and 1064 nm as options on the PicoSure Pro.
The Focus lens array is a separate mode. It splits the beam into a grid of high-intensity points that create tiny zones of injury under an intact surface. The skin repairs those zones with new collagen. Nothing is ablated, so the surface stays closed and downtime stays short — which also caps how much change you get.
Ask which PicoSure they have and which wavelengths. If your skin is deeper than about Fitzpatrick IV and the answer is "755 only," it is reasonable to look elsewhere.
Ask for a test spot if you have brown or Black skin or any history of pigment problems, and wait two to four weeks before reading it.
Take your own before photographs in consistent light.
No sun exposure, no sunbeds, no self-tanner on the area.
Pause retinoids and acids on the treatment area for several days.
Antiviral tablets from the day before if you get cold sores and the area is around the mouth.
Bare, clean skin — no makeup, moisturizer or sunscreen.
Allow 30 to 60 minutes for numbing cream if you are having a tattoo treated. Focus treatments are usually tolerable without it.
Everyone in the room wears protective eyewear.
The provider fires test pulses at the edge of the area and watches the response before treating the whole thing.
Pigment and tattoo work. Each pulse feels like a hot snap. Treated pigment usually turns white for a few minutes. A handful of spots takes minutes; a tattoo takes 10 to 20.
Focus treatments. The handpiece is passed over the face in overlapping rows, usually two to four passes. It feels like fine hot pinpricks with a rubber-band sting, warmer as the passes build up. A full face runs about 15 to 30 minutes.
Cold air is usually blown over the skin throughout.
You leave red and warm. Focus patients often look flushed and slightly swollen for the rest of the day, similar to a moderate sunburn.
Throughout: gentle cleansing, plenty of moisturizer, no scrubs or acids until the skin is calm, no saunas or heavy exercise for 48 hours, and daily sunscreen on treated skin for at least a month. Sessions are spaced four to eight weeks apart depending on what is being treated.
None. PicoSure is a medical laser in the six-figure price bracket and there is no consumer equivalent.
Home "pico" pens sold online are not picosecond lasers, do not remove tattoos, and can burn. For brown spots, a consistent routine of sunscreen, a retinoid and a lightening agent such as azelaic acid or tranexamic acid is the real at-home option, and it also prevents new spots, which the laser does not.