The Redmi Smart Band 2 causes allergies symptoms.

The Redmi Smart Band 2 comes with a band strap made of professional health antibacterial material that meets the medical criteria.
If you are allergic to the band, please check the following aspects:
1. If the band is worn too tightly with no room for your skin to breathe, then a red, itchy rash may be caused by repeated friction;
2. If the band is worn in the bath and left uncleaned for a long time, the accumulation of residues will lead to suspected allergies.
Additionally, there are some suggestions for your reference:
1. Please try adjusting the strap to your preferences during workouts. When exercising, do not wear it too loosely or too tightly to ensure that the bracelet does not slide up and down on your wrist; 
2. For daily use, you can slightly loosen the strap to ensure skin breathability and comfort;
3. After wearing the band for a long time, remove it and allow your wrist to rest for about half an hour. Wash and wipe the sweat on your arm after workouts. Clean and dry the strap before you wear the band again.
Note:
If you experience severe allergies while wearing the band, it is recommended to consult your physician before you put the band back on.