Aloha fego, Gianni...
I apologize for not seeming to answer your question directly. It was to refocus on the simplicity and power of the material we already have in front of us - the level I course. You'll find that out for yourself just as your seeing in the posts and insights coming from Gallen, AgentB, and Iam2 and others as their daily work and connection to all develops.
Darcie my wife, wonderfully reminds me of this all the time with the vast variety supplements, healing modalities, tools, etc. that I have the opportunity to interact with due to my job here at Learning Strategies, SFQ Association friends and sacred bodywork connections.
Balancing one's system with the level one exercises allows healing to go on at many levels including changing the way one digests and assimilates, food, universal energy and life.
As AgentB and Iam2 point out, it's not always about a special technique to do the job. We can all take some time and look at what Master Lin has presented and guiding us with in the Level I course philosophy and methods. As Iam2 points out, the Self Concentration exercise in itself is an entire primer in personal intention, focus, manifestation and healing. Does your friend have, borrow from you, or get together daily with you to do the level I exercises? Have you worked on your friend with the level II work -or even the introductory sword finger work found a the end of the level I course?
If one wants a jump start, they could also set up a healing session with Master Lin. Spending personal time with the level I work will take that healing even deeper.
As for undesirable hair. Qigong masters have created all sorts of effects like generating nerve cell growth, or even changing the way their eyes lids look -which is normally genetically governed. The self concentration exercise gives one the foundations to adapt from. If one puts time, energy and focus into it, many things are possible. If one wants to put in the time working with the hair in their intentions, visualizations, and sword fingering the area -a difference can be made.
Much Love, Shawn