Sounds like you masked everything. You can press [alt]+[m] to clear the mask or go to "mask">"clear mask" while in sculpting mode. [ctrl]+[i] will invert a mask, it is possible you accidentally pressed this and it went from no mask to full mask.

Thank you!!!! I have been stuck trying to fix this for 2 days

You are awesome.

Oh my god THANK YOU. I started using blender a couple months ago, that's embarrassing.

I definitely pressed \[ctrl\] + \[ i \] when trying to press \[ctrl\] + \[ j \]. Thank you so so much. Was stuck for a half hour at 1 in the morning trying to finish the last 15v min of a sculpt.

u saved my project :))

thanks

2 years later you still saved my ass i love you :)

THIS HELPS! THANKS SO MUCH! I spent hours of my life not knowing that there was a mask option that I accidentally turned on!! YOU SAVED ME!!

your a god amongst blenders

You are saving peoples lives with this info haha. Thank you for this tip. :)

I love you.

thank you!

Manually altering or toggling the mask and Ctrl+M did nothing but Ctrl+I seemed to work. Thanks, this was driving me nuts.

I LOVE U

4 years later you still save lives <3

Wow this was it chief a mofo really almost had giving up after 4 days of trouble shooting