Genetics also plays a role in determining who is at risk of developing acne. Experts agree that acne seems to run in families and that there seems to be a direct link between the development of severe acne and familial patterns. Experts are unsure why this is so, since an acne gene has not yet been discovered. However, a number of studies have shown that genetics does play a role in determining how likely a person is to develop acne. Various studies of identical twins, for example, found in over 50 percent of all cases that if one twin develops acne so does the other. Correspondingly, other studies have shown similarities among parents and children regarding the types of acne lesions, the severity of acne, and the duration of acne. A patient with acne explains: “I inherited it [acne] from my mother, and she’s always telling me that she had the exact same thing and that it will go away. I am mad that I inherited it from her.”