During stage one, the spontaneously reversible phase, the tissue is in the pitting stage, where it indents when pressed and reverses when it's elevated.
You can use either indented paragraphs, in which the first line is indented more than the rest, or block paragraphs, in which all lines begin at the left margin.
When you're starting a new paragraph, the best thing to do is just skip a line between each paragraph or an indent, like I'm doing now, it doesn't really matter.
When they had gone she took courage to bathe her hot face in one of the marble basins, and to straighten her own hat-brim, which the parasols of the crowd had indented.
To the north stretched the limpid, and, as it appeared from that dizzy height, the narrow sheet of the " holy lake, " indented with numberless bays, embellished by fantastic headlands, and dotted with countless islands.