Variable	Categories	Number	Mean ± SD	Z	P value
Patch size (cm²)	Before needling	20	4.96 ± 4.33	−2.585	0.01*
Patch size (cm²)	2 weeks after needling	20	4.45 ± 4.07	−2.585	0.01*
Patch size (cm²)	Before needling	20	4.96 ± 4.33	−3.21	0.001**
Patch size (cm²)	2 months after needling	20	4.00 ± 3.93	−3.21	0.001**
Patch size (cm²)	Before needling	20	4.96 ± 4.33	−2.692	0.007**
Patch size (cm²)	4 months after needling	20	4.22 ± 4.36	−2.692	0.007**