Upper chest upper arm
Sometimes torso lower lateral abdominal
Mostly upper chest
Only after I binged on a sweet or a carb
I have this condition on my upper arms that started around the time of PATM.
https://www.mayoclinic.org/diseases-conditions/keratosis-pilaris/symptoms-causes/syc-20351149
Some people say that it is related to celiac disease, but there is no empirical evidence to show that its true.