A piece of arm growth similar to ringworm is considered to be triggered by ringworm, psoriasis, florid chaff rash, etc., according to the cause of the choice of drugs, physical and other methods to improve. 1. Ringworm: it is triggered by fungal infections such as Trichophyton rubrum or Trichophyton mustelii, which will cause superficial fungal infections of the skin after invading the skin. You can apply clotrimazole solution, miconazole nitrate cream and other drugs, and with the taking of terbinafine hydrochloride tablets, itraconazole capsules, etc., can achieve the role of antifungal treatment of ringworm. 2. Psoriasis: it is a chronic, recurrent, inflammatory, systemic, immune-mediated disease induced by the combined effects of heredity and the environment, resulting in scaly erythema of the skin. It can be treated by applying drugs such as trimethoprim acetate, carbotriol, tacrolimus and salicylic acid cream as prescribed by the doctor, or by physical methods such as photochemotherapy and excimer laser. 3. Florid chaff rash: it is a superficial infection caused by Malassezia violating the cuticle of the skin. The onset of the disease and high temperature and humidity, fat and sweat, malnutrition, chronic diseases and the application of glucocorticoids and other factors. Patients can apply econazole nitrate cream, compound ketoconazole ointment and other medications, which can restore the skin. A piece of arm similar to ringworm may also be chronic eczema, neurodermatitis, etc., need to go to the regular hospital, under the guidance of the doctor to do the relevant examination, to clarify the cause of the symptomatic treatment.