Remember nickel allergy? It is an allergy to metals (most metals have nickel!) wherein direct skin contact can lead to itching and rashes.

Mobile phones can be a cause of nickel allergy too.

According to Slash Gear:

If you've ever felt a bit itchy after messing with your cellphone or iPod for a while, you might have to face facts that you're a bit allergic to technology. I have a slight nickel allergy, but luckily my ears and hands can handle it. Whereas my neck and wrists will break out in a rash over almost nothing. Well apparently those with a nickel allergy are the ones that need to worry.

There is cause for worry but this is something that can easily be resolved. Like opting for a a model of mobile phone that has outer rubber or some kind of plastic coated to the metal house.

Like I do. Yes, I have nickel allergy too! ;-)

And if you really cannot resist the mobile phone with a metal finish, then you can easily buy the so called cellphone condoms that are all abound these days. Yes, the cellphone condom is a like an extra, thin, rubber housing that you cover the body of your cellphone with. That way direct skin contact of the metal will be prevented. Unless of course you have rubber allergy! But then, that is another story.