What does it mean when cupping and gua sha result in red marks?

Nov 14, 2022 Source: Cainiu Health
Disease description:

I've been feeling unwell with a cold these past few days, so my husband took me for gua sha and cupping. After the treatment, I noticed my skin turned red. I'm wondering what causes this?

Doctor's answer (1)
Dr. He Haochen
It is normal for redness to appear after gua sha or cupping therapy. Clinically, gua sha and cupping promote blood circulation and help relieve fascial and muscular pain. During the procedure, subcutaneous capillaries may rupture, causing the skin to turn red. Generally, the deeper the color, the more severe the patient's condition.