I

• Immunity - resistance to illness or injury due to presence of antibodies

• Impetigo - a highly contagious skin disease caused by bacterial infection. It is characterised by red inflamed pustules that erupt and form into blisters which then scab over, it is most common around the mouth and cheek area

• Innominate - having no name, nameless or anonymous

• Insulator - a poor conductor of electricity such as rubber, and wood

• Insulin - a hormone produced by the pancreas

• Interstitial  (intercellular) fluid - fluid that bathes the cells of the body

• Iontophoresis - introduction of ionised water soluble products into the skin using a galvanic current to improve all skin conditions