A piece of ringworm on the outside of the thigh has been running, may be acute eczema or ringworm secondary to bacterial infection, can be general treatment, drug therapy and other measures to regulate. 1. general treatment: keep the skin clean and hygienic, avoid scratching, clothes choose loose, comfortable clothes, diet also need light diet. 2. Medication: (1) acute eczema: due to more exudation, need to use boric acid solution and other drugs for wet compresses first, to be exudate reduced, to be used zinc oxide ointment, mometasone furoate ointment, hydrocortisone butyrate cream and other drugs applied, at the same time, can be combined with oral antihistamines such as chlortetracycline and so on. (2) ringworm secondary bacterial infection: you can first use iodophor to disinfect, and then apply gentian violet lotion, which has the effect of astringency, you can also use topical mupirocin ointment, fusidic acid cream and other antibiotic ointment to treat the inflammation subsides, the use of clotrimazole ointment, miconazole ointment, and other anti-fungal drug treatment. If you have a piece of ringworm on the outside of your thighs that keeps running, it is recommended that you go to the hospital in a timely manner to clarify the cause of the problem and treat the symptoms. All of the above drugs should be used in accordance with the doctor’s instructions.