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A:
There should be some response after 4 treatments esp for a black tattoo. I believe there are more effective tattoo lasers for black ink such as the Qs Yag 1064 so you might see someone with a Qs Yag laser. Other ways to remove resistant tattoos is to retreat several times at the same setting or using a fractionated resurfacing laser before using the tattoo removal laser. For this you would need to see a dermatologist who is experienced in tattoo removal.
A:
currently the most effective treatment for hypopigmented scarring is the 1540 or 1550nm Fraxel laser. It does help to blend the hypopigmentation and also improves the texture, so find a dermatologist that has Fraxel laser.