Does Soap Irritate Your Skin?

My mother told me that liquid bath soaps leaves a film on the skin that can lead to irritation. She said to switch to Dove bar soap.

Now that I use Dove for Sensitive Skin, a hypoallergenic fragrance-free bar soap with moisturizing cream, my skin no longer feels dry, scratchy and irritated after a shower. I even use it during humid weather, but not on areas where I sweat easily.