Questions about lumpy lemons on my tree
I have moved into a new place recently. As the home was on the market for a few months, being flipped, I assume only basic watering was done.
There is a ~15' tall lemon tree in the backyard. It has tons of lemons, decent sized, lots of flowers now too. The tree looks generally healthy.
The lemons however have this strange lumpy look to them, practically all of them. I've linked a picture showing a sample of the two types of lemons on this tree. The lumpy one is on the left. The other one is an orange-ish looking lemon this tree is also, to a much lesser extent, producing. There is an orange tree approximately 10' away, could it be affecting this lemon tree?
What does this mean? Do I need to feed the tree some kind of plant food, I'm assuming yes since I doubt it's been fed in a long time(if ever). Is it a sign of not enough water? Or is it diseased? Most importantly, what do I need to do to square things away? Thanks for any help.