Cold
According to Dr. Lavi, a lot of people are allergic to cold or anything that includes cold, even though they don’t know that. It’s as real as it can get, he added.
Therefore, every time you spend time outside in cold or enter cold water, you’ll experience itchy hives on certain parts of your body, but mostly the ones that are exposed to cold the most, such as hands, neck, and face.
In this case, antihistamines would be helpful, Dr. Lavi added.
Jewelry
Just like cellphones, cheap pieces of jewelry are made out of nickel, which is considered one of the most common allergy triggers in humans. You can see if a piece of jewelry contains nickel if your skin turns dark green in contact with it.
However, that’s not an allergic reaction, but rather just the oxidizing reaction between the piece of metal and the acid in your skin, Dr. Lavi explained. If you’re allergic to nickel, you’ll likely experience skin rashes and itching every time you touch that jewelry piece.
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