Itchy skin after sweating may be caused by urticaria, ringworm or lichen planus, it is recommended that the patient under the guidance of a doctor to clarify the specific cause of the disease through the drug to treat the symptoms. 1. Urticaria: For patients with cholinergic urticaria, when the patient’s body temperature rises after strenuous exercise with a lot of sweating, then acetylcholine will act on the mast cells and the onset. The performance of the round papules of wind, surrounded by varying degrees of redness, conscious itching. 2. Ringworm: ringworm usually occurs in the summer, the body moist and sweaty environment is conducive to the propagation of fungi, ringworm lesions for the first time for the red papules, papules or small blisters, followed by the formation of scaly red patches, conscious itching. 3. lichen planus: lichen planus is also known as lichen planus furfur in clinic, it is formed due to malassezia infection. When the body sweats a lot, the humid environment is favorable for the reproduction of Malassezia, and the patient may have itching. Itchy skin after sweating may also have other reasons, it is recommended to go to the regular hospital in time for examination and standardized treatment under the guidance of professional doctors.