The toenail is an appendage of the skin, so to see a toenail disorder in a clinical setting, you should register with the Department of Dermatology. There are many causes of toenail changes, common causes such as nail fungus, lichen planus, eczema, psoriasis, etc. Therefore, if there are any changes in the toenail, you need to go to a regular hospital as soon as possible, under the guidance of a clinician to do the necessary examination as well as laboratory tests to give a clear diagnosis, and then need to combine the condition for treatment to avoid delays.