A rash that grows on the inner thigh, a hard bumps manifestation, if the rash occurs for a relatively short period of time, such as only a few days, and then observe the hard bumps, if the skin temperature is relatively high, the skin is red, and there is pain when pressing the bumps, clinically it is considered a boil. Boils are bacterial infections that occur after skin breakage, and can be treated with topical antibacterial medications, such as mupirocin or fusidic acid cream, and oral antibiotics, such as cefaclor, to improve their efficacy. If the above drugs do not work, it is recommended to visit a dermatology clinic to see the specific form of the rash and to rule out other dermatological diseases. Patients need to keep the area clean, hygienic and dry to avoid the secondary development of other skin diseases.