All forms of hair loss may not be curable, but the dermatologist will be able to identify the appropriate treatment regimen each time that will stop hair thinning and help prevent further deterioration. To determine the cause of the hair loss, the dermatologist will gather evidence of a complete medical history, he will carefully examine the scalp, which can provide a lot of information, and if he suspects that there is a disease behind the hair loss, he will recommend blood tests or even a skin biopsy.