In Pamporovo the new Grand Malina Hotel will have a spa centre offering health & beauty programmes, as does the Perelik, Pamporovo, Orlovetz, Mourgavets - check out any of the ski holiday brochures for details
There is a place scalled Sapareve Banya a short distance from Borovets that has the hottest springs in Europe. There is a spa hotel there which looks pretty good from the outside.