Itching and swallowing of vagina after periods may be due to some type of infection. If there is no abnormal vaginal discharge
,then minor itching needs no treatment.
Just maintain your personal hygiene with clean of your genitals, wear cotton underwear,take healthy diet, drink plenty of fluid, do light exercise and sleep well.
If itching is more with discharge, take medicine like Tab Metrogyl
400 TDS for 5 days with Single dose Fluconazole
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All the best.