Appraisal Issue involving small mold area

[Nikki Cuozzo]

Hello! 
Just received the appraisal report (for my first potential investment property) The appraiser saw a small (under 1'x1') area of what looks like mold in the bathroom over the vanity. Of course I know it's there, the inspector wasn't worried and advised me to clean it with bleach as it was dry, so it must have been from some older, but since fixed water damage from the 2nd floor unit. However the appraiser is stating it must be fixed before closing, and he will charge me an additional $200 to come inspect it after it is fixed. He will not accept ‘After' pictures. I am using a conventional loan, not an FHA. Looking for some insight on if this is typical scenario, or if there's a way I can get around that $200, or just have the seller clean the mold, pay the $200 and move forward?

Thank you!! 
Nikki