Can IPL remove brown spots?
A brown spot is easy to see and hard to name, which is why the type of mark matters before you book a light treatment. DermNet gives a useful list of what IPL is used for.
Marks IPL is used for
DermNet's page on intense pulsed light therapy names the pigmented targets: "age spots, freckles, flat pigmented birthmarks and other skin discolouration problems such as melasma". Age spots and freckles sit first on that list, so ordinary brown spots fall inside what the source describes.
Melasma on the same list
Melasma appears in that same sentence. The list covers several different marks, so it is worth finding out which one you have before treatment.
Further reading on pigment and light
For melasma, there is the PMC review Evidence-Based Treatment for Melasma: Expert Opinion and a Review and the MedlinePlus entry on melasma. On light sources, see DermNet on pulsed dye laser treatment and PMC on Unconventional Use of Intense Pulsed Light.
What to watch next
Photograph the spot now so you can compare it later. Readers in St. Johns, Florida, can ask a provider to identify the mark first, before any light is used on it.