Genetic factors for pimples.

Several studies have shown that genetic factors influence susceptibility to acne. A genetic influence is confirmed by the very high concordance between mono zygotic twins, in which the extent and severity of acne and the sebum excretion rate (SER) are virtually identical. Comedone numbers are also similar in identical twins, suggesting a genetic role in comedone formation.. Furthermore, in three pairs of identical twins, severe nodular acne developed at approximately the same time in each pair.