In this double blind randomized trial, the effect of lavender essential oil (lavandulla officinallis) and olive oil will be evaluated to treat perineal tear after delivery. Inclusion criteria: NVD without instrument and perineal tear (mediolateral episiotomy, 1 & 2 degree perineal rupture). Exclusion criteria: diabetes, kidney diseases, severe anemia (Hb<9 mg/dl in admission time), 3 & 4 degree perineal rupture. Ninety females will be selected after NVD and will be put in three groups: lavender essential oil based on olive oil, olive oil and placebo (normal saline). After educating health tips to women, we will educate them to use 10 drops of drug in 5 liters warm water as sitz bath during 15 minutes 2 times per day. Also, the researcher will evaluate perineal pain severity with VAS (Visual Analog Scale) scale and tear improvement sign with REEDA (redness, edema, Ecchymosis, discharge, approximation) scale in three groups 2 hours and 5 & 10 days after delivery.