Photosensitivity
A photosensitivity reaction does not depend on the presence or absence of a suntan or
sunburn, although it often accompanies them. Photosensitivity reactions are
immunological or toxicity reactions and result from the presence of photosensitizing
agents and UV light. Photosensitivity reactions are characterized by reddish skin with
elevated poison ivy-like bumps and can occur in areas that were not exposed to the sun.
They frequently produce little or no discomfort. On the other hand, phototoxic reactions,
another type of photosensitivity reaction, are usually accompanied by symptoms similar
to that of sunburn. Once a person gets a photosensitivity reaction, they are more likely to
have a recurrence under the same conditions in the future. (Mayo Clinic 1993)
Symptoms of Photosensitivity
Usually severe burning
Often occurs in patches and in small areas of the body.
Blotch formation
This could be a result of heat as well as light.
Rash (Photodermis)
Redness induced by light. May be the cause of itching and may appear all over the body.
Uneven pigmentation
Could be the result of light exposure combined with medication, or it might be the result
of non-light related factors such as genetic factors, pressure points or a fungus
Common diseases which react unfavorably with UV light
(are exacerbated by UV):
•
Herpes Simplex
•
Lupus Erythematosoyus (swelling of the nerve endings)
•
Porphyria-severe (extreme sensitivity to any source of light)
•
Vitiligo (irregularly shaped patches of skin with no pigmentation and dark
borders)
•
Skin cancers (Basal, Squamous, and Melanoma)
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