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Not medical advice, caveat emptor, etc etc. Aloe Vera is popular and well established for helping heal skin lesions. There’s several hydrogels on the market from reputable pharmacies that have evidence of promoting healing as well. Keeping the wound ‘dry’ but not ‘dried out’ is the trick. Take care not to peel the humectified scab off, too, which is easy to do by accident.
From professional and personal experience I can tell you that healing skin wounds exposed to the sun will scar darker. What that means is that if you don’t cover that scratch really well, like with more than a trouser leg, you’re likely to end up with a pronounced red/purple mark.
If it were me and I were set on not missing the trip, I’d maximise healing this week with appropriate ointment and care (like avoiding direct sun), and in Dorset I’d cover it with a huge plaster under UVP trousers.