I'll darken them slightly or make the hair strokes a bit thicker if the client wishes to.I normally add strokes in between the healed ones. I can even cross over a healed stroke with a new stroke for a more natural effect.
If a stroke did not fully heal, I will go over again the stroke to rebuild it.Then, same aftercare should be performed.
To maintain the result of beautiful natural microblading, I recommend to refresh it every year.
Unlike classic tatto ink, these pigments will fade over time if you do not "refresh" periodically.