It could be
yeast infection although yeast usually shows outer symptoms like swelling of the labia, redness, itchiness, or flakiness. It also causes yellow, smelling discharge.
Your swelling could be due to bacterial vaginosis, which is not an STD just an overgrowth of the vaginal
bacteria.
Both of these conditions need treatment, so now it would be a good idea to get yourself a gyn.
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