By Alta Alexander If you're one of the many millions of people who have experienced rashes and other symptoms of allergic reaction when you wear various types of jewelry, you've probably already suspected that you might have an allergy of some sort. In many instances, that allergy is probably related to the nickel that is so often used in the crafting of these accessories. People who are suffering from balding may also wonder whether nickel causes hair loss . To begin, it should be understood that this metal is the source of many common skin allergies. That should come as no surprise, given that it is a commonly used element in a variety of manufacturing processes. In fact it is so common that it can be found in everything from zippers to jewelry, certain coins, eyeglasses, and even cell phones. Once an allergy develops, the symptoms are fairly easy to spot. Rashes and itching skin are extremely common, as is dryness. More severe cases can involve blistering, cracked skin,...