In reply to Emily.
Hi Emily,
I am sorry but I do not know of any home remedies to help with a soft shell. It could be caused by a lack of vitamins and minerals therefore you need to look at their diet and probably offering some supplements, particularly calcium. The other cause could also be lack of light, especially with the development of a white spot. Turtles need light, preferably unfiltered sunlight but this is not often possible when kept as pets, so you should then use a light source/lamp with UVB light.
I would recommend a vet visit, if you can find someone with turtle knowledge, just to check it isn’t bacterial/fungal related and offer possibly suggestions. I would do this sooner rather than later as the condition is likely to worsen if not treated correctly.
I hope that helps.
🙂
Bec