According to Sushruta:- The development of Twacha follows after the Fertilization of Shukra and Shonita. The development of Twacha is caused by Tridosha particularly Pitta. The formation and further development of Twacha is similar to the formation of Santanika (cream) when milk is boiled. Just as the Santanika forms layers and gradually increase in thickness; similarly all layers are formed in the developmental stages of the embryo and join together to become the skin on the outer surface of fully developed child.

Twacha (Skin:-) covers the entire body, protecting it from various harmful physical and chemical stimuli present in the environment. various physical and chemical stimuli present in the environment.

According to Sushruta, the development of Twacha (skin) begins after the fertilization of Shukra (sperm) and Shonita (ovum). It is primarily influenced by the Tridoshas, particularly the Pitta Dosha.

Sushruta compares the formation of Twacha to the development of Santanika (the cream layer) when milk is boiled — where layers gradually form and thicken over time. Similarly, in the developing embryo, the skin forms layer by layer, eventually uniting to cover the entire outer surface of the fully developed foetus.