The double negatives here make this heading really hard to parse (I actually read the abstract thinking something totally different and had to come back to chec

The double negatives here make this heading really hard to parse (I actually read the abstract thinking something totally different and had to come back to check), maybe something along the lines of "Acne vulgaris exists predominately in Western populations" or "Acne vulgaris mostly exists in Western Populations" would make it clearer.