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: Induction of rosaceiform dermatitis during treatment of facial inflammatory dermatoses with tacrolimus ointment .
### Output Text:
Induction of rosaceiform dermatitis during treatment of facial inflammatory dermatoses with <span class="chemical">tacrolimus</span> ointment . 