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I am wondering what it could be. Is it possible for a reaction to a deodorant to only affect one side? Could it be eczema?

It is possible to have a reaction to a deodorant on only one side of your body. This could be due to eczema or another skin condition. It is recommended to try applying hydrocortisone cream to reduce inflammation and itching. If the condition worsens despite treatment, it may be necessary to try an antifungal cream.