None: No STD is a likely cause of such a symptom. The only exception might be a new case of oral herpes, but only if the swelling is accompanied by multiple painful blisters and sores. Drug allergies can cause lip swelling, so in theory an STD treatment could cause it as a side effect.
Answered 9/27/2017
2.9k views
HSV1 & HSV2: Symptoms may include: ulcers and swelling most often on the mouth, lips and gums, thighs, buttocks, or genitals. If concerned see your PCP for examination and tests.
Answered 3/12/2016
2.9k views
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