how to stop sweating excessively...?

Question: one of my friends sweats excessively. even though she's skinny and in shape. She sweats even though she's not exercising. she sweats a lot even during class, especially in the underarms. what could be wrong with her? how can she stop sweating so much?
*please, no dumb answers*

Answers:
It's a condition, but I can't remember the name. She could go to a doctor, and they give her botox shots and it does something to the glands to help stop the sweating. That's what my cousin had to do because she use to sweat so much.

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