Question
I have a lemon tree that produces ugly little lumpy lemons what could be the reason?

Answer
Hi Zack

Wind scarring
Identification tip: Shallow, discolored scars on the rind occur when fruit rub against twigs or thorns, especially on lemon trees at exposed locations.

Phytotoxicity
Identification tip:  Chemicals, fertilizers, or oils were applied a few days before this damage appeared. Phytotoxicity can resemble fruit rot disease. However, pesticide injury often forms a splash pattern, primarily on the exposed side of fruit. Herbicide (dinoseb) spray caused this necrotic rind spotting. Certain fungicides (those containing copper) and insecticides (spray oil) can cause similar injury.

These are just a few of the reasons a citrus pits.  Also just because a fruit looks ugly does not mean it is not fit to eat.  People get used to perfect fruit in stores, this does not mean they taste good.  With citrus and other fruits they taste better when we grow them.  If you feel you want to try and rid the tree of this problem after reading this I may suggest Atomic Grow which can make your tree healthy, clean and grown organically.  kathy