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Ime urine really helps.
A lot of people think you can get away with just pissing on the sting, but ideally you need some sort of emulsion to help it stay. The easiest is to add some oil into a jar in a 2:1 and shake it.
Alternatively if your mayo is in a squeezie bottle you can empty half of it and shake it up in that. The squeezie bottle also makes application easier.
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One thing to be aware of. If the swollen area continues to itch and grow you may have cellulitis which is bad. I have had it twice from insect bites in the garden. Once sorted with oral antibiotics, other worse time had to have a course of IV antibiotics at A&E. Draw round the inflamed area with a pen to keep track of spread.
Bee stings. (Not bees, I know they're quite necessary in the world.)
Got stung on my hand simply by stretching my arms up in the air as I was about to go for a walk.
This happened yesterday (so no worry about anaphylaxis) but my hand has swollen up and I can feel the swelling has gone halfway down the inside of my forearm. Will be off to the chemist when it opens to get some advice/antihistamines, and about to take some Ibuprofen and get an ice pack on it again. Anything else?