Lump near throat latch?

My friends horse has a lump a few inches from her throat latch, pretty much directly under her eye but under her head. She is 20 as of this weekend, her teeth need floating, and she's a pure-bred QH. My friend says it's sorta big (prob about a inch in diameter) and her fur is very thick under their. She was d-wormed last month. any idea what this is?

No scrape and no other symptoms? What color is the horse?

No injuries as far as I can tell. She is eating, drinking, using the bathroom, and acting fine Doesn't seem to bug her when I touch it. It's sorta hard. We don't know what it is/what to do...she is chestnut with white details

Could be a tooth problem, could be a bug bite...

thank you, I will let them know...she found it a few days ago; how long would it take for a bug bite to go away?

A week or more, in my experience. This just came on very suddenly?

I believe it is the parotid gland that you are seeing, and some horses will get swelling there that doesn't seem to go away. If it comes and goes it may be a sign of a mild allergic reaction.

Thomas

If it could be due to something she's allergic too, when my friend d-wormed her last, she said she switched her d-wormer.
She used to use Horse Health d-wormer, but the local store no longer sells that so instead she bought a different d-wormer. I think she said it was Quest, and in a green box. I don't think she has ever used this before.

I would guess an absessed tooth. My mare has one our dentist said would fall out in its own time.

There is no eye or nasal drainage? How long has it been there? Has it grown in the last couple days? It's hard to tell without pictures... it could also be an onset of strangles.
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Get her teeth checked. It could be something to do with her teeth if they haven't been done in a while. She could also be allergic to something. Has she had her shots? Strangles starts out like this. It is deadly. Make sure she's had her shots. Also, does she have a slat block. It could be some kind of build up and salt helps if they don't get much of it.