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