Dry white tongue may be because of many reason, one not proper water intake ,second not brushing properly or maintaining hygiene, dry cough and sore throat or other systemic conditions like
diabetes but other symptoms need to be there.
Four small red bumps all normal , nothing to worry about.
Next Steps
use tongue cleaner , maintain proper hydration i.e. water intake and oral hygiene.
Health Tips
follow up to oral surgeon or ent doctor if situation persist.