A recent study  has revealed that aromatherapy with essential oils can help in the treatment of alopecia areata (known as spot baldness). Massaging with certain essential oils along with carrier oils like jojoba and grapeseed) daily for seven months showed a significant improvement. Here is the list of essential oils that help.
Thyme oil: Often added to hair care products, thyme oil is known to rejuvenate hair follicles and thus, prevent hair loss. It also acts as an excellent skin softener.
Rosemary essential oil: It is one of the best oils for improving hair growth. This oil increases cellular metabolism that stimulates hair growth thereby aiding in the treatment of baldness.
Lavender essential oil: When massaged on the scalp, lavender oil improves blood circulation and thus, promotes hair growth and prevents hair loss. Moreover, it also moisturizes the scalp and balances sebum production.
Cedarwood essential oil: It stimulates the hair follicles by increasing circulation to the scalp when massaged every day on the scalp.