It can happen with products corresponding to shaving lotion, sunscreen and some perfumes. Eczema, also called atopic dermatitis, affects  between 10 and 20 percent of youngsters and 1 to 3 % of adults. A common symptom of eczema is dry, purple, irritated and itchy skin.
Host components embody heredity, sex, race, and age, with heredity being by far probably the most important. However, there have been latest will increase in the incidence of allergic problems that can't be explained by genetic factors alone. Four main environmental candidates are alterations in publicity to infectious diseases during early childhood, environmental pollution, allergen ranges, and dietary adjustments. Certain diets are formulated to scale back the itch brought on by atopic dermatitis.
“The creams that you buy can produce issues that make your authentic drawback even worse,” Katz says. Because rashes may be attributable to many different things—bacteria, viruses, medicine, allergic reactions, genetic problems, and even light—it’s necessary to figure out what sort of dermatitis you've. “The commonest form of dermatitis that is seen anyplace is an allergic contact dermatitis to nickel,” says Katz. Because of ear piercing.” Many  cheap earrings are made from nickel, and over time, carrying nickel earrings can cause an allergic reaction to the metal. The symptoms of those various varieties of rashes often overlap. “Itching is a typical symptom for all these issues,” says Dr. Stephen I. Katz, director of NIH’s National Institute of Arthritis and Musculoskeletal and Skin Diseases.
Depending on the severity, anaphylaxis can include pores and skin reactions, bronchoconstriction, swelling, low blood pressure, coma, and dying. This type of response could  be triggered all of a sudden, or the onset could be delayed. The nature of anaphylaxis is such that the response can appear to be subsiding however may recur throughout a time period. Red, bumpy, itchy skin could be irritating, painful and embarrassing.
A contact allergy is the least widespread sort of allergy in canines. It outcomes from direct contact with allergens, corresponding to pyrethrins, present in flea collars, pesticides, grasses, and materials, corresponding to wool or synthetics, utilized in carpets or bedding. Contact allergic reactions can become practically anything and at any age.