They stack because they are different types of effects. Thick Skin Aura is a "Damage Shield" and Minor Pain Aura is a "Damage Mirror", one aborbs the other merely duplicates damage done to you. There is a third similar type of effect, "Damage Reflection" which also stacks with these two which both absorbs and duplicates damage.
All of the 3 types mentioned above will also stack with two other lines of similar effects but aren't auras, one is a "Damage Absorber" and the other is a "Fading Damage Absorber".
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