You yourself has answered your own question.. You have blackskin in underarms, inner thigh which itself suggest You are Insulin resistance...
Glycomet SR(metformin) is a good insulin sensitiser.. It will decrease your insulin resistance also
Periods are regular? Are you suffering from PCOS, because metformin is good in PCOS also
Next Steps
repeat sugars after 1month
Hba1cHealth Tips
weight loss diet
walking
exercise