How to tell if hair grafts were too deeply planted?

Topical finasteride may be used by some doctors but there is no evidence it actually works. It is also not FDA approved

There is no absolute requirement to take medications. Many patients have surgery without taking Propecia or Rogaine.

If you were born with thin fine hair, multi vitamins will not help thicken your hair.  If you have poor results due to fine thin donor hair there isn't much you can do with vitamins.

You need an examination for a recommendation that fits with your realistic expectations.  You can probably have 1000 to 2000 grafts but it will not be your orginial hair density and you will still notice some thinning.

With more specialized punches, it is possible to render scars that are not visible (on the nape, neck or other region) to the naked eye following body hair extractions. My team at the Dr.U Clinic in Los Angeles developed this type of instrumentation for our patients since areas like the face,...

It is best to see a doctor for an examination if you are having issues. Pimples or infections should be treated in general.