Why the calendar is clinical
Light-based treatments work by delivering energy into pigment or water in the skin. Skin that has recently seen a lot of ultraviolet has more melanin in it and more active melanocytes, which means it absorbs more of that energy than the settings assumed and burns more easily.
Afterwards, the skin is temporarily more photosensitive, and ultraviolet on treated skin in that window is the direct cause of post-inflammatory hyperpigmentation: patchy brown discolouration that can take six months to a year to fade and occasionally does not.
Tucson has somewhere around three hundred and fifty sunny days a year, with a UV index that regularly runs above ten from May to September. Running a laser practice through that summer means either a meaningful rate of pigment complications or pretending patients will stay indoors. Neither is acceptable, so the window is October to March, and we schedule consults year-round so people are ready when it opens.
What that means for you
Four weeks of no deliberate sun before treatment. Daily broad-spectrum SPF 30 or higher, which you should be wearing here anyway. And a genuine commitment to staying out of it for two weeks afterwards, which in January is easy and is the whole reason the window is when it is.
If you are going somewhere sunny in the four weeks after a treatment, say so at the consult and we will move it. This happens most Januaries and nobody has ever regretted the rescheduling.