Hello and welcome to HCM,
Itching on the left side of labia can be due to some skin lesion.
What is your age?
As the age advances, there are atrophic changes in the reproductive tract including the vulval skin.
This condition is called lichen sclerosis
It is not a manifestation of STD
Lack of estrogens causes this condition.
Topical estrogen is used to treat this condition.
is required to diagnose this condition.
Consult your gynecologist for clinical examination and biopsy of the lesion.
Thanks and take care
Dr Shailja P Wahal