All legs swollem- allergic reaction??

[Trinkett]

It seems that my youngster decided to teach me something new every week.
So, this morning I rode her, after ride I cold hosed, turn her out for a while and then I gave her a good massage and put arnica on her lower legs (tendon area because I'm a crazy horse mom scared of tendon injury)
I went to the yard again two hours ago and I found her with all legs swollen, especially the front, hot and painful. I brought her to the yo to brainstorm and he told me it wasnt a classical stocking for being stabled and I told him that the only thing I did different (even though I already used the arnica yesterday) was using the arnica. So I cold hosed and rang the vet, told the situation and she told that it's possible it's an allergic reaction to arnica gel, she asked me about the food and even thigh it was changed its been two weeks she's on the new food and since all the legs were swollen a soft tissue injury seemed unlikely
On the vet recommendation I cold hosed again and put bandages on to stimulate circulation after I walked her for 40 minutes and the vet Also told me to give her aspirin again to stimulate circulation
My question is: have you ever had a horse with an allergic reaction to a cream?? Or a reaction were their legs swollen up?

 

[Pearlsacarolsinger]

Any living thing can have an allergic reaction to anything. I don't understand why you put arnica on your horse's legs but yes, the swelling could be a reaction to it.

 

[Trinkett]

Any living thing can have an allergic reaction to anything. I don't understand why you put arnica on your horse's legs but yes, the swelling could be a reaction to it.

I like to use anything that can help to reduce swelling, fatigue ecc that why I was using arnica, always used on my older horse and even on my parents!

 

[Pearlsacarolsinger]

It's always best to do a patch test when using something on a horse that you haven't used on that horse before.

 

[Trinkett]

It's always best to do a patch test when using something on a horse that you haven't used on that horse before.

I already used the arnica yesterday and didn't have any reaction.
I would really love to know why you feel this need to try to shame me, it's funny tbh

 

[ycbm]

I already used the arnica yesterday and didn't have any reaction.
I would really love to know why you feel this need to try to shame me, it's funny tbh

The reaction today may be either the arnica yesterday kicking in after a time lag, possibly brought on by heating the legs through today's exercise, or it could be today's lot adding to yesterday's to then be enough to create the reaction. If that's all you've changed that's pretty much what it has to be. I assume you've washed it off, so you should know in a day or so.
.