What is the appearance of the deposits?
How have they been diagnosed?
What is your age and general health?
The first thing is to see a dermatologist. Calcium deposits are not common in the skin of the forehead. Aesthetic practitioners are not trained in the wide range of possible skin conditions and this needs to be verified by a health professional.
Small white bumps on the forehead can be milia (small keratin filled cysts). Have a look at these photographs: here