It can happen with merchandise corresponding to shaving lotion, sunscreen and some perfumes. Eczema, also identified as atopic dermatitis, affects  between 10 and 20 percent of children and 1 to three percent of adults. A common symptom of eczema is dry, red, irritated and itchy pores and skin.
Host elements embody heredity, intercourse, race, and age, with heredity being by far essentially the most vital. However, there have been recent will increase within the incidence of allergic problems that cannot be defined by genetic factors alone. Four main environmental candidates are alterations in exposure to infectious ailments throughout early childhood, environmental air pollution, allergen ranges, and dietary adjustments. Certain diets are formulated to reduce the itch attributable to atopic dermatitis.
“The lotions that you purchase can produce problems that make your authentic downside even worse,” Katz says. Because rashes may be brought on by many various things—bacteria, viruses, medicine, allergic reactions, genetic disorders, and even light—it’s important to figure out what sort of dermatitis you have. “The most typical form of dermatitis that's seen anywhere is an allergic contact dermatitis to nickel,” says Katz. Because of ear piercing.” Many  cheap earrings are made of nickel, and over time, sporting nickel earrings could cause an allergic reaction to the steel. The symptoms of these different varieties of rashes often overlap. “Itching is a common 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 embrace pores and skin reactions, bronchoconstriction, swelling, low blood stress, coma, and demise. This type of reaction may be triggered all of a sudden, or the onset could be delayed. The nature of anaphylaxis is such that the reaction can appear to be subsiding but may recur all through a period of time. Red, bumpy, itchy skin could be irritating, painful and embarrassing.
A contact allergy is the least common kind of allergy in canine. It outcomes from direct contact with allergens, corresponding to pyrethrins, present in flea collars, pesticides, grasses, and materials, similar to wool or synthetics, utilized in carpets or bedding. Contact allergies can develop into virtually something and at any age.