StaticMessage component can be used to display a message without the use of a FacesMessages.
<div class="card">
<div class="grid">
<div class="col-12 md:col-4">
<p:staticMessage severity="info" summary="INFO" detail="Message Content" style="width: 100%"/>
</div>
<div class="col-12 md:col-4">
<p:staticMessage severity="warn" summary="WARN" detail="Message Content" style="width: 100%"/>
</div>
<div class="col-12 md:col-4">
<p:staticMessage severity="error" summary="ERROR" detail="Message Content" style="width: 100%"/>
</div>
</div>
</div>