I uploaded a photo to Gravatar.
Today, I just registered to post on a site running WordPress. Because personal health is discussed on this site, I used a pseudonym on the site, but much to my dismay, it seems like it's going to automatically display my picture from Gravatar. I looked through all the options in WordPress, and I see that I can change my displayed username, but there is no way to specify my Gravatar.
Is there a way to stop this WordPress site from displaying my photo, short of simply not using that site?