Iphone case moisture from hands?

I have an ipod touch fourth gen with a black silicone case on it and an iphone with a thin plastic case. Every time i pick up my ipod touch it feels really cold then there's all this fog kinda moisture all over the case where my hands were and when i touch the screen all this moisture goes on screen where fingers touched, if i hold the ipod in a tissue for a bit then eventually the case won't sweat in my hands, and when it doesn't then i pick up my iphone and there's all fog moisture on it then. Does anyone know why this happens cause my hands are dry and everything, also my ipod and iphone are in my room which is quite small if that affects this some how. So what is there really i can do about this.

It's condensation, it's cold your hands are hot thus it will cause a steam up effect, this will happen on cold windows etc aswell

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