A red ringworm in the armpit may be caused by dermatophyte infection. Local itchy skin, it is recommended to go to the hospital, under the guidance of the doctor to give anti-fungal internal and external drugs for treatment. The armpit appeared a red ringworm, first of all, we should do a good job of local care, keep the local clean and dry, avoid scratching and stimulation caused by skin lesions. Usually pay attention to light diet, eat more fresh fruits and vegetables, supplement a variety of nutrients, will help the recovery of the disease. You can go to the dermatology department of the hospital to get a clear diagnosis. Under the guidance of the doctor to give anti-fungal topical drugs, such as ketoconazole cream, terbinafine application. If necessary, with oral itraconazole, terbinafine and other drugs, have the effect of inhibiting and killing fungi, can relieve the patient’s symptoms. The appearance of red ringworm under the skin, it is recommended to go to the hospital for fungal microscopy. If the fungus is positive, antifungal drugs can be given, but need to be under the guidance of the doctor.