Genital herpes is caused by the herpes simplex virus (HSV). Unlike pimples, herpes bumps are clear or yellow, filled with a clear liquid, and are often ulcerated.

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Gray and yellow filled colors indicate tests using water (to assess material integrity) and glycerol (a blood analog), respectively. Credit: arXiv (2025). DOI: 10.48550/arxiv.2506.20718 ...