They do this when they are happy. Though also when they are spraying. Spayed cats can spray, mine does though he is male. Females can spray too even if neutered. Also cats will spray if they have urinary irritation, both my male and female have been through that, both spayed. The spray...
Please get a biopsy of this. My cat had a similar sore and we waited too long to get a biopsy as the vet didn't think it was anything. Turned out to be squamous cell carcinoma, the skin type. This is a rare place for it and my cat wasn't white and almost always it is white cats that get this...
