Mild onychomycosis may be caused by overstimulation, mechanical injury, deformed nails and other factors. Symptoms are mild, and the tissues around the nails may be red, swollen, and painful, but no abscess has been formed yet. 1. Overstimulation: prolonged impregnation with chemicals or prolonged use of poor quality nail polish may cause overstimulation of the nail area, which may easily induce onychomycosis. 2. Mechanical injuries: such as excessive squeezing, smashing, stabbing, abrasion, etc., resulting in localized damage to the nails, without timely treatment, which can easily cause bacterial infections, which can lead to minor nail groin infection. 3. deformed nails: for example, gray fingernails, can lead to deformed nails, resulting in local damage, secondary bacterial infection, will cause inguinitis. It is recommended to seek medical attention as soon as possible for examination and treatment after the symptoms of minor onychomycosis have appeared, so as to avoid causing other complications.