Take it back to Wal-Mart and see what they suggest.

"Bruce Musgrove" wrote in message
news
I spotted this on one of my orchids while watering them and was wondering
what it was. Could this be a burn mark from watewr sitting on the leaf in
the sun? I did spray with Safer brand inseciticidal soap last week at the
end of the day. Maybe I put it back in the window to soon? I looked in
the Ortho books and could not find anything similar.

http://katkom01.home.comcast.net/leafgall4.jpg3
http://katkom01.home.comcast.net/leafgall2.jpg