The recommended treatment course is 20 weeks and it needs to be prescribed according to your weight,severity of your case and your tolerance of the side effects.
Accutane will help improve acne, but it will not help the scars. Laser is best treatment option for most acne scars.
The redness the you notice is not scar. However, over a period of weeks or months it will be more clear if there are any permanent scars. In the meantime avoid further laser treatment , and avoid sun exposure.
TCA peel is not a good or viable option. Your best bet is laser tattoo removal in a medical setting, by a trained dermatologist. You will need multiple sessions, and can expect the pigment to slowly become lighter, and in some cases disappear.
It is quite difficult to quote a price. It all depends on what method is being used. There are several options. I beleive it is best for you to be seen in person and discuss everything in detail
