I have this lemon tree that I have been getting a lot of fruit for years last year and this one I notice some lemons getting what I can describe as rough skin, dont know whats causing this or how to treat, I also notice some leaf curl, I will try and upload an image hope it works

I am not sure. Because of the chlorotic mottling of the rind, and the depressed white areas it looks like a disease called "Rumple of Lemon." If so, the juice quality would not be affected. The cause of Rumple is unknown. Here is what is written in the "Compendium Of Citrus Diseases" concerning the disease Rumple. ........."Rumple is a disease of lemon fruit..... It is important only on tree ripened fruit intended for the fresh market. Juice quality...is not affected by this disease unless picking is long delayed. Rumple does not affect the foliage. ....Rumple appears when fruits begin to turn yellow. The earliest symptom is a chlorotic mottling of the rind. The chlorotic areas are slightly depressed, particularly between the oil glands. The oil glands themselves become prominent as their walls darken to greenish brown, and in the end to brownish black. The cause of rumple is unknown. No infectious agent has been implicated as a cause of the disease. Rumple may result from a genetic sensitivity of lemons to some as yet undetermined environmental factor. Rumple can be avoided by picking fruit before color break."....... Perhaps other members on this forum can offer further advise. - Millet

It also looks like wind burn.

Thank you for you're help, It does start to show up when the fruit begins to turn yellow on the other hand we have been getting a lot of wind down here, lol I guess I will have to wait and see if it's spreading.
any other opinions

It's almost certainly "silvering" caused by broad mites. At least in Florida, I'd be 99.99% certain of it.

Malcolm

Interesting, the Compendium does not mention anything at all about Broad Mite Silvering, and only allocates two sentences of information concerning the Broad Mite. In those two sentences it only describes damage to the foliage by Broad Mites. The Compendium does show some Silvering (Sharkskin) by Rust Mite, but the picture looks different from Ramon's fruit. Learn something new every day. I take it that the Rust Mite's silvering and the Broad Mite silvering appear different enough to determine which mite caused the damage. Thanks again Malcolm. - Millet

Millet,
I'd go more by climate and species affected, in determining species of mite. I'd be surprised if rust mite is a common pest in dry Tijuana, whereas it is a problem here. Also, Broad mites are more common on lemons, limes, and (in some climates) grapefruit, whereas rust might is more on mandarins, oranges, and (in some climates) grapefruit. But rust mite injury is a possibility as well. Here's a bulletin on broad mite: http://edis.ifas.ufl.edu/CH020

Malcolm