"Through gua sha the body releases the stagnated tissue stored in the muscles. The red marks indicate where the damaged tissue is.
"We can massage her body accordingly, giving her a full release which in turn gives her mobility and flexibility back in the affected area."
Petechiae look like a rash or bruising but are in fact blood cells that have been pressed out of the capillaries during the process.
As the body starts to reabsorb them, it improves circulation and creates an anti-inflammatory effect.
"Depending on how damaged that area is it can go from a light pink colour to very dark black purple colour," Hitesh explained.
"Light pink indicates just every day fatigue, red marks show little bit more tiredness and damage.
"When it goes purple and black indicate old very stagnant stubborn double inch which might take a little bit longer to deal with."
Grace is one of several hairdresser clients who see Hitesh, while professionals who also stand in awkward positions all day such as dentists and mechanics can also benefit from the treatment.
The treatment that Grace had released all that stagnation giving her mobility and reducing pain and inflammation.
Hitesh' post about Grace has certainly caught people's imagination and has been shared 20,000 times since he shared it.
Hitesh also shared a photo of another hairdresser client, Caroline Sharpe, who is being given the same treatment showing the same results.