Albino clawed frogs

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I noticed a subcutaneous formation on my pet's side. Has anyone encountered this?
What's it? Is it dangerous? After feeding, it becomes more noticeable.
That was a week ago:
photo_2021-05-11_21-34-09.jpg
So now:
photo_2021-05-15_17-00-22 (2).jpg012.JPG

The frog is 13 years old.
Tank 30L, temperature 23 C, water replacement is made with standing water (more than a day). There is no filter. We change the water every two to three weeks. We feed them with bloodworms, never gave vitamins. The size of the frog is about 7 cm.
 
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Looks like Frankenstein...
In all seriousness I’m not sure. Looks like it could be some sort of parasitic infection but I’m not sure. You would probably get better results posting on an amphibian forum.
kno4te kno4te is good with disease, maybe he has some idea what’s going on.
 
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