Ringworm starts as a flushed, small pimple on the inner side of the femur near the scrotum, followed by the formation of small white scales on top of the pimple, and the rash gradually spreads to the surrounding area. Ringworm is a skin disease caused by a fungal infection on the inner side of the femur, perineum, and buttocks. The main symptom is obvious localized itching. This disease is easy to recur. Mostly due to contact with patients suffering from ringworm or through cats, dogs and other infections, or through clothing and utensils and indirectly infected, or first suffered from tinea pedis, due to scratching and spreading and infected. Summer season, the climate is hot and humid, the human body sweating, especially within the stock, such as not timely bathing, or wearing tight underwear a large amount of sweat can not evaporate, it is easy to get this disease. In addition, patients suffering from diabetes, excessive leukorrhea, etc., as well as long-term oral or local application of a large number of broad-spectrum antibiotics or corticosteroids, are also prone to ringworm. In terms of incidence, it is mainly young people, more men than women. The disease occurs most often in the summer, and the humid or hot climate tends to aggravate the condition, which is relieved or cured in the winter. Diseases that cause rash symptoms on the inside of the femur near the scrotum: Scrotal eczema: a subtype of eczema, commonly known as “hydrangea wind”, “cellular leakage sores”, etc. It is a kind of allergy caused by internal and external factors. Eczema is a subtype of eczema commonly known as “hydrangea” and “cellulite”. It is an allergic skin disease caused by internal and external factors. The red bumps on the epidermis of the scrotum are itchy and scratching may cause oozing and even infection. Its high incidence of people for: long-term in the hot working environment, cabs, truck drivers, construction workers, outdoor workers, chefs, etc., due to the perineum heat dissipation is not smooth, it is more likely to lead to scrotal eczema. Ringworm: a skin disease caused by fungal infection of the inner femur, perineum and buttocks. The fungus of jock itch can be spread through underwear, bath towels, etc. and also through sex, so jock itch is also included in sexually transmitted diseases. However, more than 80% of ringworm is clinically transmitted through non-sexual intercourse. Skin disease: refers to the disease about skin, is the skin (including hair and nail) by the influence of internal and external factors, its morphology, structure and function are changed, produce pathological process, and accordingly produce all kinds of clinical successive performance. The incidence of skin diseases is very high, recurrent, more light, often does not affect the patient’s life, many difficult to cure. The most obvious is itching and skin appearance changes. Common skin diseases are psoriasis (psoriasis), vitiligo, herpes, rosacea, impetigo, septicemia, pyogenic infections, scabies, scars, ringworm, ichthyosis, armpit odor, acne, folliculitis, pemphigus, alopecia areata, infantile diaper rash, corns, freckles, sweating herpes, acaridic dermatitis, eczema, hives, gray fingernails, scleroderma, itchy skin, alopecia, melasma, as well as sexually transmitted infections such as syphilis, condyloma acuminata, Gonorrhea, non-gonococcal urethritis, etc.