1yo Pekingese/Chihuahua mix has a sudden round mass on her face.

Hello, vets! The bump showed up within the past day or two as I had not noticed it before. If feels hard, or at least very firm. I can’t feel it through the other side of her mouth. Today it looks more raw than it does in my attached pictures, and I don’t think it looks any bigger. Pimple, cyst, or something else entirely? How long should I wait for it to clear up on its own before spending money on a vet trip? Thank you :)

Hello!   Pimples, cysts or follicular infections may be possibilities, as may Demodecosis (Demodex is a sort of mite) and even cancer.  It can be difficult to tell from a photo and sometimes a sample is needed.  Our advice would therefore be to make an appointment.  At best, a cyst or pustule may burst before the consultation happens, but at worst the lesion could expend to cover a larger area or turn out to be sinister, so it's worth planning a check.   Best of luck - and please do let us know!

(ps to be very clear, cancer would be extremely unusual in such a youngster.   As there is hair-loss, it may be worth being aware the possibility of Ring-worm and washing your hands appropriately, although this usually occurs without a swelling or lump.

I don’t know if this has any impact, but I myself have had some rather itchy red patches popping up (seemingly with no cause) on my torso arms and legs. Is ringworm something transmitted between humans and animals? If I were to have that, would it make it more likely that she may have it also?

I went to check it out again to see if there was any change. It’s bleeding. I cleaned it up with a paper towel and it seems that only the front half of the lump is raw.

OK, if it's getting traumatised to the point where it's bleeding I think definitely it's vet check time. Good luck!

OK, if it's getting traumatised to the point where it's bleeding I think definitely it's vet check time. Good luck!