In the words of a great man: you're holding it wrong.

You're not supposed to grip the magic mouse. Hold it with your thumb and ring finger on either side of the apple logo at the bottom, palm wresting on the mouse pad, and use your index and ring fingers for clicking and scrolling.

When you click, your fingers should be in the dead centre of the mouse.

Or just get a magic trackpad.

So what you're revealing is that somebody can hold the mouse wrong, which means a point of failure of design. the magic mouse is shite and causes wrist / arm pain, basically what people call carpal tunnel, the magic mouse is problematic at best.

No other mouse gives me the same trouble. Its the mouse not me.

It's not because I don't know how to use the three sea shells.

Yep! No one believes me that the Magic Mouse pinches my fingers.

How does a mouse give one a rash?

Alloy has nickel in it. Nickel causes contact dermatitis for a lot of people, me included. My MBP does the same and is coated in vinyl sheet to stop it literally making my hands bleed.

Apple is one if the only vendors that actually doesn't actually consider biology when designing a product. Even the shittiest Lenovo or no brand Chinese clone laptops are made of better materials.

So I use my Lenovo instead and the MBP sits there like a lemon waiting until I can be arsed to clean it out and eBay it.

LOTS of people have this problem. My dermatologist said that he sees 3-5 people a week that have contact allergies on hands and ears that use apple products. I tried to email apple about it - never heard a thing back.

Edit: 2 days of using an MBP without vinyl around it: http://i.imgur.com/HgDquuE.jpg

This is strange. The Macbook Pro is anodized aluminum - shouldn't have nickel in it, but it might have copper/zinc traces, which are also allergenic to some people.