Could my dog have mange?

I have a 3 yr. old boxer she has some bald spots (small) on her back..could it be mange or ringworm?
Please help..
If a dog has mange will the hair grow back?
Here is a picture I took right now.
She also has some dadruff..
http://i115.photobucket.com/albums/n305/dreamgirl_10/NewImage-2.jpg
Update: She scratches in that area (her back)
she had hair last week , then this weekend I noticed it getting bald ;(
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