Thanks for talking on the phone.
She has two issues;
1) The skin sensation of biting and burning.
2) Absence of period for 3 years.
A multivitamin, vitamin B 12, and iron supplement would definitely help in both of her problems.
The laboratory testing done for the absence of period (termed as secondary amenorrhea) should include measurements of serum prolactin, thyrotropin, and FSH to test for hyperprolactinemia, thyroid disease, and ovarian failure. Apart from pregnancy other causes of missed or delayed periods are;
1) Ovarian hormone dysfunctions
2) Thyroid hormone abnormalities
3) Stress, anxiety, emotional disorders
4) Sudden weight loss or gain
5) Excessive physical activity
If all the hormonal and above causes are ruled out, one of the most common types of secondary amenorrhea is functional hypothalamic amenorrhea, which by definition rules out pathologic disease. In this, there is a decrease in hypothalamic gonadotropin-releasing hormone (GnRH) secretion. Multiple factors may contribute to the pathogenesis of functional hypothalamic amenorrhea, including eating disorders, exercise, and stress. However, in a few women with functional hypothalamic amenorrhea, no obvious precipitating factor is evident (this might be true in your case).
Please read this link and the following heading; 3.0 Treatment of functional hypothalamic amenorrhea and concomitant medical conditions
Read the resource under the heading secondary amenorrhea;
The screening tests for the patient with amenorrhea include urinary HCG, complete blood count, sedimentation rate, thyroid function, prolactin, FSH and LH, and assessment of estrogen status.
Causes of amenorrhea/delayed period are drugs, and systemic diseases, hypothalamic and pituitary amenorrhea, "postpill" amenorrhea; hyperprolactinemia, androgen resistance, etc.
Wishing you a speedy resolution and all the very best in life.
It was a pleasure to assist you.
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