A sweaty face bumps, itching may be hives, contact dermatitis and eczema and other causes. 1. Urticaria: after sweating, sweat stimulation leads to temporary expansion of small blood vessels in the skin mucosa and increased permeability, localized bumps and itching and other symptoms. 2. Contact dermatitis: the patient may be allergic to sweat, after the sweat is not cleaned up in time, resulting in the appearance of facial pimples, itching and other allergic reactions. 3. Eczema: after sweating, patients may induce eczema or make the original eczema aggravated, resulting in patients with face long bumps, itching and other adverse symptoms. When the patient after sweating, face long pimples, and there are itchy symptoms, it is recommended to go to the hospital in time for examination and diagnosis, and under the guidance of the doctor to choose the appropriate treatment.