Any Idea What This Skin Irritation Could Be From?

It’s on my upper, inner thigh. It’s red and feels like it’s dry, but it burns anytime something touches it; my clothes, water, lotion...anything. There’s just a little dry skin on the same spot on my other thigh, but nothing nearly as bad or as painful.

I think it might be from my pants, but I’ve been wearing the same pants for years now. I haven’t switched detergents or body wash.

I’m not sure if it’s just dry skin that has become irritated, a rash, or eczema? I’m also not sure if any remedies that won’t be painful.

Thanks in advance.