Liz Buchanan BVSc MRCVS
Keymaster
Hello! Given that she isn't bothered by it / it doesn't seem to be itchy, I would be wondering about Ringworm, which is infectious to people - particularly if young or immunocompromised - and other animals, so ought to be ruled out fairly early on. Other possibilities may include demodex mites / bacterial infection / a traumatic injury / scrape, a FB under the skin and (sorry! - but by no means the most likely) cancer. There are less concerning possibities, but it's definitely worth speaking to the vet.
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