Coal tar is a dark, viscous liquid obtained during the process of coal carbonization. It has been used for various purposes due to its unique properties, including its ability to treat skin conditions such as psoriasis and eczema. Coal tar's mechanism of action (MOA) involves several key factors that contribute to its efficacy in treating skin disorders.

Additionally, coal tar has anti-inflammatory effects that help to reduce redness and swelling associated with skin disorders. This is achieved by suppressing the production of inflammatory cytokines, which are molecules that contribute to the inflammatory response. By reducing inflammation, coal tar can help to improve the overall appearance of the skin and promote healing of affected areas.

Moreover, coal tar has keratolytic properties that help to remove dead skin cells and scales from the surface of the skin. This is important for treating conditions such as psoriasis, where an excessive buildup of skin cells can lead to flaking and scaling. By promoting the shedding of dead skin cells, coal tar can help to improve the appearance and texture of the skin, leading to a smoother, more even complexion.

Furthermore, coal tar has antibacterial and antifungal properties that help to prevent infections and promote healing of the skin. By inhibiting the growth of harmful bacteria and fungi, coal tar can reduce the risk of secondary infections and speed up the healing process. This is particularly important for individuals with compromised skin barriers, as infections can further exacerbate their skin conditions and delay healing.

In conclusion, coal tar's mechanism of action involves a combination of antipruritic, anti-inflammatory, keratolytic, antibacterial, and antifungal properties that work together to effectively treat a variety of skin disorders. By targeting multiple aspects of skin health, coal tar can provide relief from itching, reduce inflammation, promote exfoliation, prevent infections, and support healing. As a result, coal tar continues to be a valuable treatment option for individuals with psoriasis, eczema, and other skin conditions, offering both symptom relief and overall improvement in skin health.