2 doctors weighed in:

Why does my vagina swell up and itch sometimes?

2 doctors weighed in
Dr. Dennis Higginbotham
Obstetrics & Gynecology
1 doctor agrees

In brief: Many possibilities

The most likely reason would be a yeast infection.
However, it could also be an allergic reaction from exposure to soap, doedorant (found in some tampons/pads), laundry detergents, spermicides, etc. Other possibilities would include std's such as chlamydia, gonorrhea, herpes, or hpv. Finally, there are dermatologic conditions like lichen sclerosus et atrophicus, padgets disease, and others.

In brief: Many possibilities

The most likely reason would be a yeast infection.
However, it could also be an allergic reaction from exposure to soap, doedorant (found in some tampons/pads), laundry detergents, spermicides, etc. Other possibilities would include std's such as chlamydia, gonorrhea, herpes, or hpv. Finally, there are dermatologic conditions like lichen sclerosus et atrophicus, padgets disease, and others.
Dr. Dennis Higginbotham
Dr. Dennis Higginbotham
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Dr. Dennis Higginbotham
Board Certified, Obstetrics & Gynecology
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