Acne and acneiform eruptions during pregnancy need special attention. The physician should be aware of the special condition of a pregnant patient. Acne treatments may aim to prevent worsening, secondary infections, scarring and lowering self-esteem of the mother. However, the treatment of acne and acneiform eruptions are not easy to treat during pregnancy. First, because many cosmetics and procedures are not tested on pregnant patients and it is impossible to predict the possible consequences of the procedures on fetus, many women quit cosmetic procedures during pregnancy. Second, the underlying conditions such as hormonal influx and immunosuppression continue. Third, the medications for acne have limitations due to the lack of evidence of safety during pregnancy. Here, a acneiform eruptions during pregnancy, including acne vulgaris, acne rosacea, perioral dermatitis, and hidradenitis suppurativa, are reviewed focusing on these points and each of them is evaluated by clinical presentation, differential diagnosis and treatment options focusing on maternal and fetal safety.