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