If your friend has a milder form of the condition, then you can give a relaxing massage. Just be sure you understand which position he/she will be comfortable with. You can apply more a lighter pressure and avoid any percussion.

If your friend has moderate or severe symptoms, then the lower back will be a local contraindication. This massage recommendation is similar to other severe condition.

This massage recommendation will be different once you graduate, as you will have a lot more skills and knowledge in how to treat people with those issues, but at times, even a skilful therapist would avoid working on these conditions once they are severe.

Does it make sense?