I did a design on my thigh and it lasted a WHILE. Then I did a design on my inner forearm and the results weren't long lasting at all. What's the difference?
The difference can be the rate of exfoliation, the texture/thickness of the skin or the quality of the dye.
I find that designs on my legs - upper and lower last longer than designs on my arms. The skin on my arms is softer and probably thinner than that on my legs - I think my arms may also get more abrasion bathing kids etc.