The white ulcers on the seams of the feet may be caused by rubella, or it may be caused by skin infections, or it may be caused by ringworm of the feet, with different causes and different treatment methods. 1. rubella: rubella is a skin folds due to warmth, moisture, friction and other stimuli and superficial inflammation, the disease can lead to patients with foot seams white ulcerated manifestations, the treatment should avoid soap, hot water and other undesirable stimuli, but also the use of izacacrine, zinc oxide oil, boric acid solution, wet compresses. 2. Skin infection: skin infection is due to bacteria and other pathogenic bacteria infected foot skin caused by the disease, patients with this disease can appear foot seams white ulcerated symptoms, treatment, you can use mupirocin ointment, fusidic acid cream for treatment. 3. Tinea pedis: Tinea pedis is a kind of epidermal fungal infection caused by dermatophytes, and patients with this disease can have symptoms of white ulcers on the seams of the feet, and for treatment, topical medications such as clotrimazole, miconazole, terbinafine, and amorphophallus cream can be used for treatment. In addition to the above diseases, other diseases can also lead to the symptoms of white ulcers on the seams of the feet, and it is recommended to consult a doctor in time to deal with it.