Hi goalie,
I have lots of freckle sized dots (some joined) of non pigmentation on my forehead, I have an appointment with a dermatologist but not til December (long waiting list!). There is a bit of a debate as to what it is at my doctor's surgery. From all my research I think mine looks most like pityriasis versicolor or Tinea Versicolor. This is a type of fungal/yeast infection. They often prescribe selsun or nizoral shampoo for it which is anti dandruff shampoo I know sounds odd but its used because its anti-fungal.
The other thing it could be is vitiligo (i think thats what its called).
I am still trying to treat mine and I unfortunately do have a fungal skin condition on my body which looks different more like mild eczema in circular shapes all over which flares up after baths and heat but also effects the pigmentation so I have areas of non pigmentation there too at the mo.
I think you are best going to see your doctor to find out and then can go about treating it.
best wishes
M.B