Answer: Enterobius vermicularis (pinworm) eggs
Pinworm eggs measure approximately 60 micrometers in length and have a classic asymmetric oval shape with flattening on one side. They usually take on a striking deep orange color on Pap stain.
The eggs are fully infectious within 4-6 hours of being laid, so it is not uncommon to see a folded larva within the egg.
As mentioned by Kevin and Prasad, these eggs may have been introduced via contamination from the perianal area or could represent an ectopic pinworm infection involving the genital tract. In either scenario, clinical investigation and treatment are indicated.