First question: How sure are you that you have a male/female pair? Male laticuada can be very territorial and aggressive.

My first move would be to isolate the ailing individual. Even in a male/female pair, the male can sometimes be overly aggressive and the submissive female will not have adequate access to basking sites, food, etc. Set her up in her own cage, make sure her temperatures and humidity are adequate and supply a small amount of food daily. Small crickets, fruit based baby food, crested gecko diet, etc.

As for the lump, without a picture it's hard to say. Female day geckos will store large quantities of calcium in their endolymphatic sacs but that would be seen on both sides of the throat rather than just one. Can you post a photo of the lump?

Get her separated, get her comfy and see how that goes.

Good luck!

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