A handmade soap is not always a natural soap. For sensitive skin, a natural soap containing a high percentage of olive oil is the best, avocado oil is also good. The soap also needs to be produced correctly ending up with the correct ph and cured for at least 3 weeks. Goat milk soaps are especially good, as they are very mild and soothing. A fragrance free soap is probably your best bet, but soaps with soothing essential oils such as Lavender are good too. Most essential oils and fragrances are going to be irritants.