Drawing where it hurts on a diagram says more than a paragraph. The chart in a note has a pen, text labels, an eraser and zoom, and it saves with the note.

Open the chart

A Body chart field in a note shows Choose chart if the template left the choice open, listing the clinic's uploaded charts, or opens straight onto the chart the template fixed. The drawing area has a toolbar:

ToolUse
PenFreehand marks. Set Color and Stroke width first; many clinics use one color per finding type.
TextPlace a short label such as sharp, 7/10.
EraserRemove a mark.
Hand / PanMove around a zoomed chart without drawing.
Zoom in, Zoom out, Reset viewFor fine detail; the saved image is the whole chart.
Clear allRemove every mark.
Change chart, Remove chartSwap the underlying diagram, which clears marks, or remove the chart from the note.
A body chart drawing area with toolbar buttons for pen, text, eraser, hand, color, stroke width, zoom in and out, clear all and change chart, and marks drawn on the lower back.
A posterior body chart with a red pen outline on the lower back and a text label reading sharp, 7/10.

Saving

The marks save with the note; on a phone or tablet draw with a finger or stylus. Once the note is completed the chart is read-only like the rest of it. If a save reports one of the body chart images failed to save, reopen the note and save again before completing it.