For exactly the same reason it makes the skin elsewhere on the body sweat: many ‘hot’ spices stimulate nerves in such a way that the body thinks it’s being burned, which results in a variety of effects including increased sympathetic nervous system activation.
The sympathetic nervous system is part of the autonomic nervous system, which handles reactions that are considered automatic or unconscious. The sympathetic system increases activity of systems associated with the “fight or flight” response, preparations for physical exertion that might take place during physical combat or in fleeing from immediate threats.
In simple terms: the body thinks it’s being physically damaged and freaks out, responding in a whole bunch of ways that would help if we needed to run away from danger, and increased sweating is one of ’em.
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