Which organ is associated with skin disease?

The lung is closely associated with skin diseases in Traditional Chinese Medicine (TCM) due to its role in governing the body's external defenses and regulating the skin's condition. In TCM, the lung is responsible for the distribution of Qi and fluids to the skin, which helps maintain its health and resilience. When lung function is impaired, it can lead to issues such as dry skin, rashes, or other dermatological problems, as the skin becomes less capable of maintaining its moisture balance and barrier function.

Additionally, the lung is linked with the concept of "wei qi," which represents the body's defensive energy. A deficiency in wei qi can lead to an increased susceptibility to external pathogens that might cause skin ailments. Conditions such as eczema, psoriasis, and hives often find their roots in disturbances related to the lungs according to TCM principles.

The other organs mentioned—spleen, heart, and kidney—each have their own considerations and connections to various health issues but do not have the same direct association with skin diseases as the lungs do within the framework of TCM.