Any ideas on this lump?

[millikins]

As title. It was present when we bought her 4 years ago, has got bigger but very slowly. Isn't soft as though full of fluid but slightly squidgy, like a lipoma on a dog. No pain, heat, doesn't mind you prodding it, never weepy or attracting flies. Can be moved under the skin. No lameness on the leg.
The vet's coming for jabs in a couple of weeks so will mention it to him/her but wondered if anyone here has any ideas. TIA.

 

[Barton Bounty]

Its covered in hair ? Isnt it? Wouldn’t think it would be a sarcoid?

 

[meleeka]

I’m going to say sarcoid. Mine had a couple under the skin like that, although it is a weird place to have one. It could have sprouted there as a result of an injury.