are they just spots or does it feel like there is something on the skin?
it looks like she might have been infected. the picture is not really that clear but i highly recommend seeing a vet.
Especially if those spots were not there before. Could be a wart.
That (in red circle) right there does not look like a flat skin and it seems a bit risen. It looks like papilloma.
Please see a vet before it spreads to more areas.
it can be easily treated (they freeze it) if it is indeed papilloma.