Colouring the hair is a common practice whether it is to hide the greys, change your natural hair colour or highlight and streak certain portions for cosmetic purposes. At times, hair dyes can causes a severe allergy which is usually localised – only affecting the skin of the head. This is known as allergic contact dermatitis. In other instances, the use of a hair dye can have systemic effects – affecting the entire body. A systemic reaction to hair dye is not common but can be quite severe if it occurs.

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