Side effects of having bulletproof skin?
In this world, there exist a race of humanoid people which, for simplicity, we'll call Rockfolk.
Their skin is grey, and visually resembles stone. It is also exceptionally tough and durable, to the point where it cannot be pierced by modern firearms, even if such weapons actually could damage an equivalent mass of inert normal stone. Bullets hit their flesh and are flattened on impact or richochet off, without harming the individual in any meaningful way.
On top of this, their flesh is flexible enough for them to still be mobile and live out normal lives in the same fashion as humans would.
Other than this one major feature, Rockfolk resemble humans as closely as is physically possible for a race with such a feature.
The question is: How closely is that?
Assuming their bodies function in such a way that having such skin is helpful, or at least not actively detrimental to their health, what other features or qualities would they necessarily have (or lack) that would differ from a human?
For example, I imagine they would not have any body hair, as it could not pierce through their own skin, and thus they would be vulnerable to cold when exposed.
Note: This is not a question about whether or not having bulletproof skin is possible or plausible. Assuming it is, and this is what it looks like, I'm interested in possible and plausible side effects.
This post was sourced from https://worldbuilding.stackexchange.com/q/105913. It is licensed under CC BY-SA 3.0.
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