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: We describe herein 3 patients who developed rosacea - like dermatitis eruptions while using 0 . 03 % or 0 . 1 % tacrolimus ointment for facial dermatitis .
### Output Text:
We describe herein 3 patients who developed rosacea - like dermatitis eruptions while using 0 . 03 % or 0 . 1 % <span class="chemical">tacrolimus</span> ointment for facial dermatitis . 