What is the cause of my client’s skin condition? Is it truly Lichen planopilaris? What is the best way to help him?

This fits that diagnostic criterion and is as useful a label as any. In actuality, it is a viral condition and thus is amenable to reversal using the Lightworker Healing Protocol and Deep Subconscious Mind Reset to facilitate virus removal and healing of the karmic underpinnings, which are a component as well, linking his symptom emergence back to trauma events in prior lifetimes that create the vulnerability, causing this to burst forth symptomatically.