Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
prolonged contact with wearable devices may contribute to skin irritation or allergies in some users . 

```
. OPTIONS: ['Contract by using' 'Unilateral change' 'Choice of law' 'Arbitration'
 'Unilateral termination' 'Jurisdiction' 'Content removal' 'None'
 'Limitation of liability'].