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A sudden rash or an allergic reaction despite having no
history of sensitivity, could be contact dermatitis. Symptoms
usually develop after a period of repeated physical contact and skin
sensitization, and contact dermatitis occurs most often on the stomach,
the scrotum/groin, and/or the legs (or in other spots with less hair or hairless).
Dogs suffering from contact dermatitis will most likely suffer from
rashes and/or bumps which occur on the skin that has come in contact
with the ground (i.e., the chin, neck, chest, abdomen, groin, anal area, scrotum,
tail, and between the toes). These rashes may stop abruptly at the
hairline. Other common symptoms include itching, which is usually
severe, and swelling.
Your veterinarian will also want to perform bacterial cultures. A
clip of hair may be taken from a patch in an area that is not affected,
applied to a sample of the suspected antigen, and observed for possible reaction. Skin biopsies are also sometimes required.