How to soothe rash caused by Pantene hair product?

I was using this deep conditioner from Pantene, and it gave me a rash all over my arms, back, chest, and stomach, plus irritated my scalp. Is this possibly an allergic reaction or just a skin irritation? What are some ways to soothe the skin and scalp?
How to soothe rash caused by Pantene hair product?
How to soothe rash caused by Pantene hair product?
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