Most of the reactions caused by skin care products occur on the face, hands, and body, wherever these products are used. Other causes include hair care products, including hair dye and permanent solution, and face makeup products. Eczema may occur for unknown reasons or as a result of exposure to certain plants, foods, animals, nickel, rubber, soap products or dyes. This can produce itchy rashes and weeping blisters. This is a common problem with all jewelry made with nickel as a base metal.
Hives are another kind of skin response.
They may occur as a result of changes in body temperature or stress. Hives may be small, red, itchy swellings on the skin. They also can be very large and cover a major part of the skin surface. They arise quickly and can last up to 48 hours. They may appear in clusters that disappear as another cluster develops.