Wow! This site was very impressive, whether or not you suffer from any sort of allergies. There is a video, so you may be prompted to download such video software to be able to watch it. There is also a transcript, but I honestly would recommend watching the video, and not only reading the transcript, because the visuals are so incredibly helpful! It explains how our immune systems mistake things like pollen and pet dander, and we can become allergic to them. The video explains so much in such a short amount of time, from how an allergy becomes an allergy, to how it affects our bodies.

This is a very informative video on how and why an allergic reaction occurs. It is a "general" allergy video and does not discuss Nickel allergy in particular.

Good overview of allergic reactions in general, but has nothing specific about nickel, so is disappointing in that manner.