In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Her sensation of light touch and pain was diminished over the lateral side of the right forearm and wrist area .
### Output Text:
Her sensation of light touch and pain was diminished over the lateral side of the right forearm and wrist area . 