Sometimes these are so hard to figure out without seeing where the plant is growing, etc. If you grab the plant between two fingers (one on the affected area) and give a gentle squeeze and it doesn’t feel squishy, that’s a good thing. Cactus can suffer with bacterial and fungal infections for some time – Euphorbias do not. If they get and infection it goes like wildfire and the plant can turn to goo pretty quick. Because it is spread out like that and looks a little affected all on the same plane, is it possible it got sunburned? Otherwise some kind of mechanical damage like the hail you mentioned could be a reason. Hail damage usually shows up within a week or two from when it happens and looks like freckles or pock marks. These can get larger over time but not usually. If it felt pretty much like any other part of the plant then I would wait and see – maybe the sunburn or mechanical damage scenario. This will never go away and will become a scar and an addition to the character of the plant. This is also common to see on cactus and euphorbias as they get older. Due sometimes just age as well as the introduction of some kind of damage they develop a very corky, barky appearance on their trunks. For more expert information contact the San Diego Cactus and Succulent Society at: http://sdcss.net/
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