Now I am not sure what this is, but it has become more prominant in the last couple of weeks but it first appeared one day when I took it out side, and think it is sun burn. I am not sure though and the leaves are very pale yellow.



And here is another pic of a new leave forming, it isn't a good pic but the leave looks funny.

Go down about 12 threads where someone (Andreane) posted "Why are my lemon leaves brown" (or something like that). It may help.