It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that when the Messenger of Allah (peace and blessings be upon him) applied a hair-removing paste, he would begin with the pubic area, and he would apply it to that place himself.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20052