Well you may start with a diary >>keep track of times that you feel the flushed feeling >> then you look back at these times and look for common factors >> temperature, activity, time of day, recently ate and drank what >. those kind of things..
A diary such as this may be a helpful tool for this type of issue..
Depending on symptoms your doctor could look for factors including estrogen, progesterone, FSH and LH levels >> looking for menstrual cycle relationship..
Also TSH, T4, T3 levels ( thyroid when you may be due again)
C-reactive protein, sed rate ( non specific markers of inflammation ) these are elevated with many types of conditions from lupus or rheumatoid arthritis or infection or injury ... (Not very specific but helpful screening tool)
A CBC with differential may be helpful as a general look at your blood counts and immune activity...
The flushing alone may not be itself a serious symptom but may more often be an aggravation...
You may even find if you take an anti-inflammatory medicine such as Advil that later you may feel this ( it alters your body thermostat and you may dilate capillaries and break a sweat such as you were having a fever..)
I hope that this is helpful. let me know if you have further questions. Best regards,
Anthony Bray MD