Is it permissible to pray with light ink or kfyn (a type of stain) present on the area between the thigh and the testicle, and how is it to be washed?

The default ruling for ink and the area between the thigh and the testicle is purity. Prayer performed with them is valid. The area does not need to be washed unless its impurity is confirmed. When performing ghusl (definition) for major ritual impurity, care must be taken to ensure water reaches this area, as it is among the hidden places that must be sought out.