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My sister had her ears pinned back, not because of baldness, they just stuck out :] Although you can't see any scarring there is what looks like to be a trapped piece of skin at the back of each ear. The operation was performed under local anaesthetic about 11yrs ago -- so maybe it is less noticeable when performed these days. If you get it done then post a message eh, wouldn't mind knowing how it went, as, I could do with mine sorting out too.
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One thing is though, she did have to wear a big bandage all over her head for a week or so (she even went to school like that, bless her), looked like she'd had a run in with a JCB :] It was also incredibly painful for her for the few days after, however, she is one of life's moaners, so... etc.
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Cheers,