What is the lump on my lhasa breast?

Answers:
SEE THE VET!

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You didn't say how old your dog ways, but you really need to have that check out from the vet. It could be simple as a swollen gland or something more serious. Please don't out guess it the more you wonder what it is the harder it will be for your dog. It could be nothing really just have the vet check her out. Better safe than sorry. I hope you find things to be ok.

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It could something very simple or not. We here have no way of telling you what it is only your vet can do that.
Get your girl into your vets and let them examine her then they can give you the correct diagnosis.

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mamary tumors are not uncommon in a dog, about half are benign.