I was reading through Vampire: the Masquerade 20th Anniversary edition, and while reading up on Obfuscate I couldn't find a mention of a blood cost at all, except for on the level 3 power Mask the Unseen where it says the character may appear more attractive by spending “more” blood points. More than what though? There doesn't seem to be any cost with it. Can anyone tell me if I am seeing it right?
You are correct. Disciplines don't cost blood to use unless they say they do.
Note: Unless stated in the description, Disciplines cost no blood or Willpower points to activate. (p.128)