Why is the face the most common of area's of the body to get acne? The face and shoulders/chest area? Why do we not get acne on our legs, hands, lower arms, abdomen etc?

Answer:
Actually, occasionally, you can get acne on the legs or upper arms. But, the answer to your question is that there are more oil glands per square millimeter of skin on the face, chest and upper back, than there are elsewhere, so when the hormonal stimulus occurs for the oil glands to begin hypersecreting at puberty, these are the areas that would be most prone to breaking out.
Answer:
the face and chest produce more oils. i don't really notice my legs or arms oily or greasy but between the breasts and on the face have oil glands.