Thanks for writing.Laser
light treatment depends on skin types and dose has to be adjusted according to it.
You have got post inflamatory hyperpigmentation
It is a thing not to worry much.
Use a good sunscreen.
Start applying a mild steroid
Avoid using soaps for few days.
Forehead scarring can be better treated by derma fillers rather than lasers and you can go for it.
Hope this will solve your problem.Take care.