I gained about 100 pounds in the last year and I’ve noticed I sweat a lot around my tummy and back area even when I’m not doing anything?

Just sitting around I notice I sweat a lot around my waist and back why is that
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Also if I have sex or dance or something my stomach becomes a sweat ball
I gained about 100 pounds in the last year and I’ve noticed I sweat a lot around my tummy and back area even when I’m not doing anything?
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