please answer this.
Answers
●An Allergen is medically defined as any substance, often some kind of protein that triggers an allergic reaction in a being who is sensitive to it or any substance capable of inducing an allergy.
According WebMD an allergy is a reaction by your immune system to something foreign infiltrating the body. Your allergy is actually the body’s attempt to expel something that does not belong in the body. This overreaction to the foreign substance is manifested by the release of histamine. The histamine is an organic compound involved in immune and inflammatory responses causing everything from sneezing, runny nose, swelling, nausea, skin rash to anaphylaxis (an extreme hypersensitive response) and other severe reactions.
●Seasonal vs. Perennial Allergies. ... If you have seasonal allergies, you may notice that your allergies are worse in the spring and fall, although it's possible to be exposed to pollen almost year round in Houston. Perennial allergies are caused by exposure to substances other than pollens that occur throughout the year.
●Hay fever is an allergic reaction to certain types of pollen. Common causes of hay fever include allergies to grass, trees, and weeds. However, all kinds of allergies can cause this condition even dust mites or mold spores.
where as , Eczema is a general term for a set of chronic skin conditions caused by inflammation. Atopic dermatitis (AD) is the most common type of eczema, and has been called the "itch that rashes." The general term “eczema” is usually used to refer to AD. The word “atopic” means an allergy that is usually hereditary, and “dermatitis” is defined as inflammation of the skin
I think mariyana is right