Reasons for not producing sha (petechiae) during gua sha and cupping

Nov 23, 2022 Source: Cainiu Health
Disease description:

The past couple of days I've been feeling a bit heavy in the body, so I went for gua sha and cupping. However, no sha (toxins) appeared after the treatment. I'd like to consult what might be the reason for this?

Doctor's answer (1)
Dr. He Haochen
The phenomenon of not producing痧 (sha) during gua sha or cupping may be due to the patient's body being insensitive to cupping or gua sha. It could also result from good blood circulation within the body, with no accumulation of toxins or blood stasis. Additionally, it might be caused by the patient having a weak constitution and insufficient qi and blood, thus preventing the appearance of sha.