Animal saliva

Can cause the skin to become itchy and inflamed. Scratching inflamed skin can cause further irritation. Remedy--clean with mild soap and water. This should clear in one to three days.

Chemical Compounds

Highly toxic chemicals, solvents, hair dyes and household cleaning fluids can cause swelling, blistering or peeling of the epidermis, the first layer of skin. To remedy, rinse well with cool water and apply a natural healing gel. Healing time, depending on intensity of irritation, is two to 12 days.

Food allergy

Foods such as oranges, lemons, peanuts, soy, corn and dairy products can produce a variety of symptoms including the swelling of fingers or eyelids and itchy skin. Keep a food diary and track reactions. Healing time depends on removing offending food from diet.

Stress

Feelings of anxiety can bring on itchiness. Scratching can become a habit that then impedes the healing process. Abstain from stimulants (i.e. coffee, chocolate), make time to relax, exercise, sleep and find a way to communicate stress to parties involved. Healing could take days or weeks.

Clothing

Wool can be an irritant for sensitive skin. In some cases, laundry detergent, softeners or dryer sheets can cause rashes. Change laundry products, and healing can be experienced within days.

More Information:

MayoClinic.com