The body is like a blueprint.

As disease and imbalance arise in the physiology, they may show us the issue that authored that pathology.
This is not meant as a substitute for proper medical diagnosis or treatment of disease, but as a guide to approach wellness from a complementary perspective.
I (and you as well) should encourage your clients to include all approaches to well-being that provide benefit, cause no harm and are aligned with the highest good.
This of course includes their doctor and/or therapist!

Here are some areas of the body and their meanings.

This is not a black & white science.
You will find there are always exceptions, i.e.
a single mother might have been a 'male' figure to us and would show up on the right shoulder/ear/neck;
the person might be left handed which on occasion could change left/right locations;
the client might be gay and the location of their relationships could show up on the opposite side depending on who is dominant.
Honing your intuition is key here and will serve you well.
Also trial and error until you narrow down the issue can be effective.
Of course, there is no substitute for experience.
The more you practice this technique, the more comfortable/confident you will become.

Also see the diagram with the body areas laid out.

Remember: In this practice, the body is like an X chromosome:
Above the waist, left side is female & right side is male.
Below the waist: Left side is male and right side is female.
Through the hips, pelvis and sexual organs, it may be either male, female or both depending on many factors.