21 days post hair transplant, will these black dots become hair? (photos)

In general transplanted hairs fall out within a month. Some of the dots may be hairs that may soon fall out.

Not to worry-any spots that had a scab(transplanted hair) will grow a hair(or hairs),even if you don't see anything now.Shafts of hair are shedding at this point and growth should become apparent within the next few months.

The scalp will become normal if you are patient. The spicules of hair that you have will eventually shed. I actually believe that they will shed soon as the direction of these hair are very irregular and appear to be ready to fall out