In a common ros sequence, which would immediately follow the review of the nails? head, neck, eyes, ears, or nose

Review of systems or ROS is part of the clinical history. History taking is a basic skill among medical practitioners such as medical doctors. Review of systems serves as to not miss any other possible pertinent information related to the history of present illness. The order of sequence in review of systems are as follows:

General
Skin and appendages
HEENT (Head, Eyes, Ears, Nose, Throat)
Neck
Breast
Respiratory
Cardiovascular
Gastrointestinal
Genitourinary
Peripheral vascular
Musculoskeletal
Neurologic
Hematologic
Endocrine
Psychiatric

To answer your concern, the nails are part of the skin and appendages review. Therefore the next in review of systems will be the HEENT, more specifically, the head. 

Ithink it may be alarm.