Eyelashes falling out

Hi, I have been struggling with hair loss on my eyelashes. This all started a year ago when I began to notice it on my right eye, and eventually one day there was an entire bold patch. After this I didn’t curl or wear mascara for a month+, but now, almost a year later, the same thing is happening. I curl and wear mascara pretty much everyday, I use the Shiseido lash curler and have been using different mascaras (both waterproof and non waterproof). I don’t know what’s causing this and how to fix it especially since it is only on my right eye, so any help would be much appreciated!