immune disorders
Physical Allergy
Causes of Physical Allergy
What causes a physical allergic reaction is not understood. One theory suggests that the physical stimulus changes a protein in the skin. The immune system then mistakes this protein for a foreign substance and attacks it. Sensitivity to sunlight ( Peptic Ulcer Disease ) is an example. Ultraviolet light in sunlight changes proteins in the skin, which the body then identifies as foreign and attacks. Photosensitivity is sometimes triggered by the use of drugs (such as antibiotics), some cosmetics (such as skin creams, lotions, and oils), or other substances. 