In my dermatology practice, I often hear some female patients complain about recurrent mycosis vaginalis due to untreated tinea pedis. Can tinea pedis really cause mycosis fungoides? Let us first understand the causes of mycosis fungoides and tinea pedis. Mycosis is a vaginal inflammation caused by Candida and is one of the most common infections of the reproductive tract in women. 80-90% is caused by Candida albicans and 10-20% is caused by other Candida and Coccidioides infections. Candida belongs to the yeast type deep fungus, but not to the mold-like type deep fungus, so the past called mycosis fungoides is inaccurate, clinical mycology now call this disease “vulvovaginal candidiasis”. Candida is a deep fungus, but often invades the skin and mucous membranes as well. The fungus is a conditional pathogen, the normal human skin, oral cavity, vagina, intestinal mucosa has a small amount of Candida parasitic, usually “peaceful coexistence” with the body, only when the body’s immunity, long-term application of broad-spectrum antibiotics, corticosteroids and immunosuppressants lead to lower genital resistance, vaginal acidity increases, Candida It is only when the body’s immune system decreases, long-term application of broad-spectrum antibiotics, corticosteroids and immunosuppressants lead to a decrease in genital resistance and an increase in vaginal acidity that Candida can multiply rapidly and come out to “make waves”, resulting in a large amount of curdled or tofu-like leucorrhea in the vagina and significant itching of the vulva and vagina. Ringworm is a superficial fungal disease caused by the fungus Tinea capitis. Ringworm has keratinophilic properties and likes to invade the human epidermal stratum corneum, hair and nail plate, which are keratin-rich tissues, and is most likely to reproduce in a humid environment at 22-28°C. The vaginal mucosa has no stratum corneum and no keratin, and the vaginal temperature of 37°C is high for the survival of ringworm, and the vaginal acidity is also high, so ringworm cannot survive in this environment . Therefore, tinea pedis or ringworm, tinea corporis, or ringworm cannot cause vulvovaginal candidiasis. This means that the onset of vulvovaginal candidiasis has nothing to do with ringworm such as tinea pedis. However, both have reliable efficacy with the application of azole broad-spectrum antifungals.