Patient: Many ringworm-type red bumps disappear after using creams for this disease, but they will appear again within two days Is there a good medicine to eradicate them? Hospital Dermatology: Hello! If the application of antifungal drugs is effective, it means that it is a fungal infection, mainly because the area of the groin is not easy to dissipate heat and has high humidity, which is a place where fungi can easily grow. Topical medication usually needs to be adhered to for 3~4 weeks, and internal medication can be added if necessary. Also disinfect close clothing, bed sheets, etc. Most ringworm is transmitted from tinea pedis, so socks should be disinfected and not thrown in the washing machine with underwear.