Tinea corporis is a common condition that occurs in the spring and summer months and affects many people. There are many types of ringworm according to different parts of the body. Among them, tinea cruris and tinea pedis, as two of the more prevalent ones, are of great concern to patients. As a kind of easy to spread, and difficult to cure the disease, we should have how to understand this disease? What is the clinical manifestation of tinea cruris and tinea pedis? Tinea cruris, which occurs on the inner thigh skin of the scrotum, can be unilateral or bilateral at the same time. At the beginning of the manifestation of clear edge, slightly elevated erythema, gradually expanding, on the flaking, and gradually from red to brown or skin color, the central part of the lesion has a tendency to self-healing, while the edge of the erythema inflammation is more obvious, on which there can be pimples, blisters, scabs, and even vesicles. The lesions develop to the periphery, forming a ring or semi-ring, which can leave temporary pigmentation after healing, often accompanied by obvious itching discomfort. Long-term patients with local skin infiltration and hypertrophic changes. In severe cases, it often extends to the inner femur, perineum, anus, and its lower edge is clear. Sometimes the skin lesions can also spread to the scrotum, the root of the penis and other places. The clinical manifestations of tinea pedis are of various types, one, erythema blister type: erythema, flaking and small blisters, itchy, easy to repeat, this type occurs in summer. Second, impregnated vesicles: usually between the rubbing parts such as between the toes of the epidermis impregnated with white, peeling, the base of the red vesicles, oozing, easy to secondary bacterial infections, accompanied by excessive sweating, usually in the hot, humid summer aggravate the condition, itching is obvious. Repeated scratching can cause dengue, lymphangitis, cellulitis, foot pain, redness and swelling, limitation of lower limb movement. In addition to the above two common conditions, there also exists a hyperkeratotic type of tinea corporis. This kind of tinea corporis is mainly manifested as flaky erythema with hyperkeratosis (thickening and roughening), diffuse thickening of keratin, roughness without sweating, desquamation, and the surface covered with fine white scales, with obvious texture in the center. The lesions are often bilateral, mostly on the palms of the feet, and spread to the dorsum of the feet, ankles, this type of stubborn and difficult to cure. How exactly does ringworm and tinea pedis find their way to the door? The dermatophytes that are the culprits of tinea cruris and tinea pedis can spread between people, animals and people, pollutants and people, and different parts of the human body. In the case of sharing shoes and socks, walking barefoot on public facilities such as public bathrooms, gyms, swimming pools and other public facilities in close contact with the pathogenic bacteria, are susceptible to infection. In addition to close contact with pathogenic bacteria, ringworm and tinea pedis are also easily contracted during humid and warm seasons and areas. Because the fungus that causes ringworm prefers a warm and humid environment, the disease creeps in during the warming climate, increased rainfall, and late spring/early summer seasons, and eases or heals in the fall/winter when the climate is dry and cold. Especially in Nanjing, is located in the middle and lower reaches of the Yangtze River, every year and the rainy season, a series of 20 days are cloudy and rainy, a lot of places are flooded with “mold” strength. The obese are prone to jock itch? Ringworm occurs in men, especially the obese. Many obese patients with ringworm, thigh root of the two parts of the skin completely pasted together, its secretions, dirt and so on are not easy to remove. And the local temperature is high and damp, very suitable for the growth and reproduction of fungi. Relatively speaking, women suffer from ringworm relatively less, but if the body is too obese, the local factors in the summer will also be conducive to the growth of fungi, so women may also occur ringworm. In addition, local hygiene and body resistance will also affect the occurrence of ringworm. Patients who have been bedridden for a long time and are physically weak, especially those suffering from diabetes, malignant tumors, tuberculosis, or long-term use of corticosteroids or immunosuppressants are more likely to develop ringworm than healthy people. In addition, wearing tight underwear and chemical fiber underwear with poor breathability, or often engaging in driving under high temperature will lead to increased local temperature and sweating, which is more likely to occur ringworm or make the original ringworm aggravated. Ringworm or psoriasis? In addition to ringworm of the hands, feet, jock itch and other common parts of the body, tinea versicolor can also cause infections on smooth skin other than the hands, feet, perineum and femur, which is called “tinea corporis”. Tinea corporis begins as a red papule or bullous pimple, and then develops into a well-defined ring-shaped lesion around the periphery, usually without oozing on the surface. Tinea corporis is characterized by scaly erythematous plaques with active, expanding edges. The center tends to subside, and some ring-shaped lesions can appear again within the ring-shaped lesions in the shape of concentric rings. It may be accompanied by varying degrees of itching.