Birth marks are classified into vascular and pigmented lesions and it is difficult to determine the type of "birth mark" this is in the photo. If you noticed any changes in it recently such as enlarging, ulcerations, or pain you should have it evaluated soon by a physician. You "mark" does appear to be small enough that you could have it excised and the area closed with a suture line. The bald patch would be gone, but you have would have a linear scar that would not have hair but could be easily concealed by the surrounding hair as long as you keep the your hair with some length. This can be performed under local anesthetic or general if you prefer. Depending on the exact margins and the amount that needs to be removed, it may need to be performed with multiple excisions to avoid tension on the closure and widening of the scar. Please seek a certified physician in your area to assess the mark and discuss the procedure details with you in person. Good luck and I hope this helps.
