There are several possibilities for ringworm on the elbow: 1. Neurodermatitis, which can appear as patches, deepened skin furrows, elevated skin crests, covered with a little scaling, and mossy lesion performance. The cause is mainly due to physical stimulation or mental tension, stress, and poor rest and sleep. You can apply topical halomethasone ointment twice a day and take oral levocetirizine hydrochloride capsules one capsule every night for anti-allergy and anti-itch treatment. 2. Consider the possibility of psoriasis, the cause is not clear, may be related to genetics, trauma, smoking and other factors, can see red patches or plaques, covered with silvery white scales. You can take oral amineptin tablets and apply topical carbotriol ointment for treatment.