JAMES STEVENSON / SCIENCE PHOTO LIBRARY JAMES STEVENSON / SCIENCE PHOTO LIBRARY
Skin reddening caused by an allergic reaction to a leather wrist strap. Allergies are an immune response to normally harmless substances. It is thought that the substance (allergen) reacts with proteins in the skin, forming a new protein. This new protein evokes antibodies to itself, making the patient sensitised. Whenever the patient is in contact with this substance again, the body shows the signs of an immune response, such as the reddening seen here.
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