Yes, I agree with TLH - I did mean 'repair' as in the fins were damaged, either by nipping from another fish or against gravel/decorations, and now they might be growing back. My Angel fish had the same thing when I bought him because his fins were nipped.
What size is your tank and what other kinds of fish do you have?
I would definitely keep an eye on them and if it looks to be getting worse, it's possible it could be fin rot.
What are your water parameters (ammonia, nitrite, nitrate)?