Hi Jojoe..reminds me of a cacti with similar leaves that I used to have before..I remember my plant then grew happily in a dappled light area but was killed only by being left outdoors during a wet winter. My plant did not get those blemishes, has always stayed green. Somehow the blemishes reminds me of my orchids when they get too much sun. But I could be wrong..or maybe it is just the natural senescence of the plant, and may still grow newer leaves as it drops the older ones. How does the stem of the cacti look like? Does it look mushy? If it is still firm and rigid, I am thinking it maybe just the plant shedding off older leaves..though a little alarming because of the rate it is doing it. Some succulents go dormant as summer comes in, while others go dormant in winter..
Just my thoughts...
