White raised bumps on flowering phanopolis

[Callie99]

This is my first flower stem from her. Then I started noticing raised white bumps on her leaves. they haven't spread. The bumps are only on the top leaf and on the bottom leaf. On the top leaf they are on the top part off the leaf and on the bottom they are on the underside of the leaf. They just started appearing a few weeks ago and I don't know what they are pure what to do to prevent them. I can't post pictures for some reason. I will try to figure it out.