Hi Ether,Helichrysum is excellent, and can be combined with Tamanu
(carrier oil with wound-healing, anti-inflammatory properties). All that's needed for skin wounds are these -- if there's deeper bruising, other anti-inflammatory oils can be helpful: Plai, Frankcense CO2, Ginger CO2 and German Chamomile CO2.
For a larger bruised area, a sample recipe might be (for each ounce):
A base of 100% Tamanu, or 50:50 with Borage Seed, then:
35 drops Helichrysum
35 drops Plai
16 drops each Frankincense CO2 and Ginger CO2
8 drops German Chamomile CO2
(actually, it's easier to measure the essential oils first, then add the carriers to fill the bottle to the proper amount
I realize that's a lot of oils, and really including any in addition to the Helichrysum will likely be helpful.
All the Best!