Can I use a hair thickener spray after 2 weeks after FUE Hair Transplant? The grafts should be fixed after 10 days I suggest.

If your donor area was over harvested and you want to fill in the area with beard hair, don't you think your beard area will look over harvested?  You may want to consider SMP.

If you have questions after your surgery, it is best to ask your surgeon since your surgeon knows you best.  In general doctors will recommend you don't use tobacco after surgery.

It may or may not look "right" but at this point it is too late.  It's been done.  You would need to wait to see what the results may look like in 6 to 12 months.  If you trusted your doctor with your surgery, you need to trust your doctor if your doctor says "not to worry". 

It is unfortunate but FUE is not a "scarless" surgery.  You cannot remove the scarring but you can consider Scalp MicroPigmentation (SMP).

It is best to ask your surgeon about post operative care as each doctor has their unique regimen. In general, minoxidil is not required after surgery.

If you are having fevers it is best to contact your doctor for a follow up.  You need an examination and possible treatment.