Skin redness and pain may be caused by contact dermatitis, herpes zoster, dengue and other diseases. 1. Contact dermatitis: when the skin comes into contact with cosmetic products, cleaning agents and other sensitizers are prone to allergic reactions, which can lead to skin erythema, pimples, accompanied by itching, tingling and other symptoms. 2. Herpes zoster: the disease is mainly caused by the activation of varicella zoster virus latent in the body, which can appear on the skin along the nerve zoned distribution of erythema, clustered blisters, accompanied by pain, and so on, and usually the lesions do not exceed the midline of the body. 3. Danovirus: the disease is mainly caused by the infection of bacteria such as beta-hemolytic streptococcus and other inflammatory diseases of the skin and subcutaneous tissues, there may be edematous erythema of the skin, accompanied by a burning sensation, pain and so on. Skin redness and pain may also be caused by other diseases, it is recommended that patients go to the regular hospital in time for examination and treatment, after a clear diagnosis under the guidance of the doctor standardized treatment, to avoid self-treatment delay.