Bleaching soap is a type of soap that contains ingredients designed to lighten the skin. These ingredients, such as kojic acid or vitamin C, work to reduce melanin production, the pigment responsible for skin color. Bleaching soap is often used to lighten dark spots, even out skin tone, and reduce the appearance of hyperpigmentation. 
Here's a more detailed breakdown:
Definition:
Bleaching soap is a soap formulation that contains ingredients aimed at lightening the skin. 
Mechanism:
These soaps work by inhibiting melanin production, the natural pigment that gives skin its color. 
Common Ingredients:
Kojic acid and vitamin C are frequently used in bleaching soaps. 
Purpose:
Bleaching soaps are commonly used to address hyperpigmentation, dark spots, and uneven skin tone. 
RDL Bleaching Soap:
One specific example is RDL Bleaching Soap, which aims to lighten skin and reduce dark spots, while GT Bleaching Soap is another option that is claimed to have disinfectant properties. 
Warnings:
While skin lightening products can be beneficial, it's essential to be aware of potential risks, such as uneven skin tone, irritation, or even permanent discoloration, and to seek professional advice when needed.