Q.Lime Tree
On our lime tree each lime, as it grows full, starts forming a stump. It looks like a miniature version of a tree stump on a lime. I haven’t done too much research yet, but being online in this site I wondered if you have a possible clue/know how or what it is/might be and how to treat if it is a health hazard.
I have not found any information on a disease of lime trees that has the issue you describe.
If you wanted to send an image it could help with identifying the problem.
Here are some links for you.
https://www.gardeningknowhow.com/edible/fruits/lime/lime-tree-tips-care-of-lime-trees.htm
https://www.gardeningknowhow.com/edible/fruits/lime/problems-lime-trees.htm