Btw before you say that's blood or something, that's not blood or anything like that. It's called "eid henna"

Eid henna refers to the tradition of applying henna (a temporary dye made from the henna plant) to the hands and feet of women and girls in preparation for the Eid al-Fitr and Eid al-Adha celebrations. It is a significant cultural practice in many Muslim communities, particularly in South Asia, the Middle East, and Africa