If you only get Minoxidil in certain places, does it still stimulate hair growth everywhere? I can't get it everywhere

If you only apply minoxidil in certain places you shouldn't expect hair growth elsewhere (where you are not applying it). This seems logical.

For the most part, minoxidil works best where it is applied. Applying minoxidil to the left side of the scalp does not do very much to stimulate hair growth on the right side of the scalp. However, a small amount of minoxidil can be absorbed into the blood stream and can stimulate hair growth in other areas in individuals who are really sensitive to the medication.About 5 % of women using minoxidil for scalp hair loss will develop hair growth on the face and rarely increased body hair as well

Yes, minoxidil can be absorbed through the skin and into the body. That is why some people get fainting as it can cause transient low blood pressure. The drug minoxidil was originally designed to treat high blood pressure and it was taken orally. In some parts of the world, the oral drug is used to treat hair loss.