Causes and Symptoms
Labels Dermatitis
The causes of dermatitis vary:
- Atopic dermatitis. Most doctors think that AD results from an
immune overreaction inside the body that leads to inflammation
and cracked, itchy skin. The breaks in the skin then let in more
allergens, irritants, and microbes that made the skin itch and burn
even more. A more recent theory holds that some cases of AD are
caused by a defective gene for filaggrin, a protein in the skin that
normally holds in moisture. - Contact dermatitis. Contact dermatitis can be caused by a wide
range of allergens and irritants. Allergens may include rubber; the
nickel and other metals used in jewelry; perfume and perfumed
soaps and creams; hair dye and cosmetics; poison ivy and poison
sumac; and neomycin, a common ingredient in topical antibiotic
creams. Common irritants include laundry soap, skin soaps, dishwashing
detergents, silver polish, shower cleaners, household
ammonia, and similar products. - Cercarial dermatitis. Cercarial dermatitis is caused by parasites
that spend part of their life cycle in the water in ponds, small
streams, and along shorelines. Swimmer’s itch usually appears
within four to forty-eight hours of exposure to water containing
the parasites. - Radiation dermatitis. Sunburn is caused by ultraviolet (UV) radiation
from the sun or a tanning lamp. In rare cases it is caused by
occupational exposure to x-ray and other medical imaging
equipment. - Seborrheic dermatitis. The causes of seborrheic dermatitis are not
completely understood. It is thought to result from an overreaction
of the person’s immune system to a fungus that lives on the
scalp. Emotional stress or changes in the seasons may cause
flare-ups.
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