How can I tell if I am allergic to something?

I am a Nanny and I would like to know how to tell the difference between allergic reactions and just random skin rashes. Thank you.

I'm at a loss on what my husbands allergic to. At first I was thinking it was wheat, or yeast or gluten but now i'm lost again. He can eat tortilla shells and grapenut cereal, ...show more

I'm not sure if this is an allergic reaction or what, but I just noticed a quarter sized red mark on my jaw line. I don't have any skin problems and this is the first time ...show more

How can I tell if everyone on here is just plain mean when you ask them Something that you do not know about? I mean it is not like I have ever Committed a crime that was a major violation on here, I put a question In here about how unfair it was for...

I am allergic to my apartment, but I don't know from what! I just moved into a new place in New York City, and noticed that I have all sorts of allergic reactions whenever I step inside my room. I've been taking Claritin but it's wearing off quickly...

For some reason I developed eczema around the age of 12. I learnt that it can develop from an allergic reaction to certain foods but I can't tell which foods, or how.

I have some rashes [red]big ones on the right side of my back...near to the hip and its itching badly.Its not spreading yet.I have been applying "equate"antiallergic with 1%hydrocortisone but its still the same.I dont know whether its allergic...

I've worked with someone for over a year now who has two young children. We work in close proximity to each other so people in my team tend to chat to whomever they are near. This colleague is totally obsessed with her children. They are literally all...