Why is there an allergic reaction when wearing the Xiaomi Smart Band 9 Pro?

The standard wristband of the Xiaomi Smart Band 9 Pro is made of professional healthy antibacterial material. Due to individual differences, a small number of people will have discomfort reactions to specific materials and have symptoms of suspected allergies.
The reasons for allergic reactions generated by the band are listed below:
1. If you wear the band too tight, the air between the band and the skin is not circulated, leaving marks and repeated friction leading to redness and itching;
2. Wearing after bathing and not cleaning for a long time, residues accumulate and lead to suspected allergic symptoms.