The NHS lists a number of causes of acne. All of them are systemic, so they will not affect one part of the face more than any other.
The basic mechanism is:
Acne is caused when tiny holes in the skin, known as hair follicles, become blocked.
This is caused by the over-production of sebum, which is not affected by any of the organs listed.
Yes. While there would be no vertical component to pure a pure horizontal velocity vector, direction can be changed via collision with the ground. To some degree it's like banking a billiard ball off of the rail and changing it's direction by 90deg. In the case of a running vertical jump, you were able to change the shape of "the rail" on the fly via your ...