Psoriasis has no direct relationship with cows. The reason why it has such a name is that on the one hand, the skin surface of some psoriasis cases is rough leather-like, very much like cowhide. On the one hand, psoriasis is very easy to relapse, difficult to cure, and is as tough as cowhide. Aofuqin Calcipotriol Ointment is a drug that can treat psoriasis, and its therapeutic effect is quite significant. It is a commonly used external drug for psoriasis in clinical practice.