How do you treat a chemical burn? let me tell you the story

The chemicles are: ajax, orange oil remover

so I was cleaning my grandmas bathtub because it hadn't been cleaned for a couple months

I put tons of different chemicals and cleaners and I don't have any gloves

I put one last chemical in the bathtub cause this stain was BAD.

i touched them

my thumbs skin started stinging it is know the morning it is red and there is a liquid coming out of it please help it isn't bad I just want to know how to treat it