Axolotl chin bumps?

[WiltedOrchid]

I am the grandmother to two axi’s and have had them for several years now while my daughter has been in college. We’ve done great with keeping their water at ideal temps and the ph/etc where it needs to be although it’s been hard to raise the ph even with the crushed coral (in panty hose so they don’t get cut). Recently I’ve noticed Kirby her albino has a yellow spot on her back, and the small chin bump Mochi the Leucistic has had for a couple years has grown into two?! And is noticeably larger.
We’re about to move from Florida to NC, and once up there we will seek a good vet to take them to but until then I’ve been doing weekly tea baths for the past two weeks. They’re both eating very well and seem ok despite the physical signs so I’m not sure am I just being overly paranoid?

thanks in advance for any help/advice!!