Hey everyone

this is my first post becuase i usually find my answers in other threads but this time i couldnt find anything so it worried me.

Today when i was petting my little baby girl, Layla, shes 4 months old, i felt a "knot" under her skin it almost feels like a little pea size cyst under her skin.

i pushed on it a little and it didnt seem to phase her so i'm assuming that its not hurting her in anyway at the moment. I know i have to go to the vet and i called them as soon as i found it to make an appt but they didnt have any openings until next week...is this something that i should take her to the emergency vet for? and has anyone else experienced anything like this?? if so what was it? please help!!