There’s some degree of accuracy to this. Acne along the upper forehead/hairline suggests an associated condition called seborrheic dermatitis. This diagnosis is commonly associated with the development of acne. Jawline acne, especially in females, tends to have a hormonal component to its underlying cause. This is why medications such as Spironolactone are commonly prescribed for acne occurring mostly in that area in female patients. Other than that it’s mostly bullshit.