You have what is known as silver skin and is a reaction to the oxide mixing with the ink. It is not harmful as such but you have to make sure that it is well moisturised with a non-scented lotion and whatever you do do not pick at it.
Some ppl with sensitive skin react to this and vitamin e in a similar way.
If you find that it goes extremely tight, and starts to split weep a clear or discoloured fluid then you need some anitbiotics immediately.
The top layer can take up to 2 weeks or so to shed. It is likely you may need a touch up but nothing too major.
Also if it blisters or pops (leaving a hole or crater) make sure that it is really kept clean and avoid picking at the edges - the area will heal but the ink will have dropped out so will need a touch up when healed.
The only difference between a person with tattoos, and a person without is this. The person with tattoos does not care if you do not have any.