What is eczema?

My friend won't leave me alone and she'll look at my arms and chest and say you have eczema and i had a zit on my chest and she said its eczema. And i looked it up and its called Chicken bumps (keratosis pilaris). But she annoys the fuck out of me like if you have it doesn't mean i have it. Aren't they two different things?
What is eczema?
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