What is the ruling on using Topix, Caboki, and Oom Oom medical hair powders, which adhere to the scalp for 12 hours to cover bald spots and thicken hair, and are composed of fine hair-like particles?

There is no objection to using a wig-like hairpiece made of synthetic hair for someone who has lost their hair. This is even more permissible than hair transplantation. The International Islamic Fiqh Academy has affirmed the permissibility of correcting acquired defects, such as hair transplantation for someone who has lost their hair.