I would add some aloe vera gel for sun burns or other minor burns. You can also apply a small amount of toothpaste to minor burns to take the sting out.

Not sure if anyone carries anything for rashes like poison ivy but if you crush up a plain aspirin and mix it with some non scented hand lotion it will reduce the inflammation and itch.

I will also be carrying some Bag Balm with me. It is great for just about everything.