That don't look that bad at all....
It should settle with antihistamine orally like cetzine 1tab at bedtime.
Thanks so much , can i ask how long and will it get worst without medical care?? There is no blister a present will these appear, I try not to strach...
Sure does look like plant induced dermatitis.If this breaks out blisters, then you need a med.Otherwise anthisan should be ok.Temporary pigmentation may be there.