Hi Customer (name blocked for privacy)-
It sounds like you have some burst blood vessels on the skin surrounding your testicle, caused by the oral sex.
To be safe, however, you should be seen by your doctor if the mark does not begin to fade in the next day, or if you begin to feel pain in the general area or any lumps/tenderness. These are all signs of something more serious.
In the future, encourage your sexual partners to be a bit more gentle, particularly in the testicular region.
Sincerely,
Emily
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