If you notice purple marks on your legs, start by observing when they appeared and whether they are changing. If it is safe to do so, take a photograph in natural light so you can compare the appearance over time.
Avoid vigorous massage, aggressive rubbing, or applying extreme heat to an unexplained discolored area. If you suspect a minor bruise, gentle care may be sufficient, but extensive or unexplained discoloration should be assessed rather than treated at home without knowing the cause.
Think about recent bumps, exercise, new medications, and other symptoms. Share this information with a healthcare professional, particularly if the marks keep returning.
Most importantly, do not accept alarming social media headlines as medical explanations. The photograph cannot establish that sleeping with another person caused the discoloration, and the marks should not be used to draw conclusions about someone's private life.