Yes, it can be washed. The eye is the least likely part of the whole body to leave a scar. If there will be a scar, it should be a scar after tattooing the eyeliner. You are in Shanghai, where many big hospitals have laser eyeliner washing. You can find a general anesthesia before washing, it won't hurt a little, and it will swell after washing for about 5-7 days. Pay attention to arrange the rest time in advance.

Wenzhou No.3 People's Hospital-Plastic Surgery-Lin Chuan