I wonder if I've had KP all my life

I was officially diagnosed with KP a few years ago by a dermatologist.

But I wonder if the "heat rash" I had as a kid on the back side of my arms (triceps area) was KP all this time, and it just spread to my shoulders later in life.

Has anyone successfully pinpointed their KP flare triggers? I think I was using a moisturizer that didn't work for me, my KP got better when I stopped using it. And I wonder if synthetic shirts (like workout gear) have an impact as I wear them a lot, but in the summer I wear tanks and my KP is better ... Hard to tell since sun exposure helps KP too.