Alopecia totalis and universalis are both more extreme versions of areata.
Totalis is the total loss of hair on the head including the brows and eye lashes.
Universalis is the total loss of all hair throughout the whole body.
The nails are affected by both and become brittle and often distorted. Neither leave scarring and the follicles remain alive but empty in both conditions.
The follicles lie dormant and may regrow hair at any time or not at all.