What is the ruling on the adhesive patch used for blood glucose monitoring, which is placed on the shoulder for 14 days, in the case of performing ghusl (ritual bath) after major ritual impurity (janabah)?

The entire body must be covered with water during ghusl al-janabah (ritual bath after sexual defilement). The presence of patches prevents water from reaching the skin, so they must be removed during ghusl if their removal does not cause harm. If there is harm in removing them, then masḥ (wiping over) should be performed over them, by analogy with a splint (jabirah).

However, the ruling of jabirah does not apply to blood glucose monitoring patches, because their placement is not necessary, their removal is easy and causes no harm, and traditional methods of glucose monitoring are sufficient.

Therefore, these patches must be removed when performing ghusl from janabah, and it is not permissible to wipe over them.