The Study of Twacha in Rachana Sharir of Ayurveda: A Review Article

The skin is the outermost and most visible part of the human body, making it easy to observe and examine. Because it is constantly exposed to sunlight, microorganisms, pollutants, and potential injuries, the skin plays a vital protective role. It acts as a natural defense barrier and has a strong ability to heal itself after damage. The skin also reflects a person’s emotions, neurological responses, behavior, and overall health; reactions such as sweating and flushing are commonly visible on the skin. Changes in skin color are especially important in clinical assessment and diagnosis. For example, pallor causes the skin to appear pale, jaundice results in a yellowish discoloration, and bluish skin indicates reduced oxygen supply. Skin rashes are characteristic of diseases such as chickenpox, measles, food allergies, and drug reactions. Other conditions, including moles, hyperpigmentation, age spots, and acne, arise due to various skin pathologies. Because of its importance to appearance, people invest significant time and money in maintaining healthy and attractive skin. Everyone desires an energetic and youthful appearance of the skin. Dosha, dhatu, and mala are the fundamental components of the body (sharira). Twacha is considered the upadhatu of mamsa dhatu and also serves as its moolasthana, as it covers and protects the mamsa dhatu. Various aspects of twacha, including its origin (utpatti), layers, and related disorders, have been described by Acharya Charaka and Acharya Sushruta in different ways. The skin plays a vital role in maintaining normal physiological functions. Acharya Yogaratnakara has included twak pariksha in the ashtavidha pariksha. Therefore, understanding the structure (rachana) and function (kriya) of the skin is essential for managing diseases and their treatment. Twacha is the seat of various twak rogas, and almost every disease presents with one or more symptoms manifested on the skin. It is also the seat of sparshanendriya. To understand pathological changes (vikriti), one must first understand the normal state (prakriti). The skin is an indispensable body part as well as an important sensory organ. In modern times, physicians face numerous challenging and emerging diseases, along with new presentations of classical disorders, making clinical practice both demanding and intellectually engaging.