An unusual case of long COVID has resulted in a man's legs turning blue after 10 minutes of standing.
The 33-year-old patient has developed a condition called acrocyanosis, which is when leg veins don't allow blood to flow back up to the heart and instead collect in a pool.
A minute after standing, his legs begin to redden and then become increasingly blue over time as his veins become more prominent. An itchy sensation then develops.
They go back to normal after two minutes of sitting or lying down.
The patient started to experience the condition after catching COVID. It also saw him diagnosed with postural orthostatic tachycardia syndrome (POTS), which causes an abnormal increase in heart rate when standing.
His case has been documented in new research published in the Lancet journal.
Author Dr Manoj Sivan, from the University of Leeds, said it was important to raise awareness of acrocyanosis being a potential side effect of long COVID.