I have a 1999 SILVER CREEK single wide. When I shower in the stand up shower I have a drip in the ceiling. Are there pipes in the ceiling?

There shouldn't be. Are you sure you shower head isn't spraying a fine mist up on the ceiling? Take a closer look.

Are there pipes in the ceiling? Some years back I worked as a line plumber in mobile home factories and we don't pipe our units overhead. Sounds like Bob nailed your problem. Remove the shower head and soak it in Lime Away or CRL and when you reinstall see if that doesn't stop your drip. Good luck, Tom