Skin blood flow is a limited finding
Minson and colleagues measured how skin blood flow changed during local heating. Their experiments identified an early nerve-related response and a later response involving nitric oxide, a signal that helps blood vessels widen.
The study measured a local response. It did not show that a wellness device resolves a circulation disorder, clears blocked vessels or produces lasting improvements in vascular health.
Do not judge by redness or warmth
Feeling warm is not a circulation test. A clinician needs your symptoms and, where appropriate, examination or tests to assess a suspected circulation problem. Ask for advice before using heat if circulation or temperature sensation is reduced.
Symptoms that need care
New pain and swelling in one leg can signal a blood clot and need urgent medical assessment. If chest pain or breathlessness occurs with those symptoms, seek emergency care. A wellness session should not delay that assessment.