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.
Answered 6/25/2015
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