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It is not clear why you would want to put lemon juice on your head or why you believe it may help with dandruff. You can consider using anti-dandruff shampoo.
I am not familiar with using lemon juice for dandruff. While it probably won't hurt your follicles anything like this are things you should run by your treating physician since they have their own list of things to do and to avoid.
At this time you can do whatever you want as everything is healed by this time. Lemon juice will not harm the area.
This underscores the importance of a correct diagnosis in hair loss. If Lichen Plano Pilaris is suspected you will need appropriate investigation by a dermatologist.
Some men in their early 20's go on to have hair transplant surgery. There is no rule. It is best to consult with a doctor regarding your specific goals and your Master Plan.
Donor hair (permanent hair) is not affected by Propecia (finasteride). If you have hair loss issues on your donor area it probably means there is something else going on.