The reasons for the red grips on the skin are skin allergy, vascular nevus, viral warts and so on. 1. Skin allergies: red pimples or erythema can appear on the skin, accompanied by itching symptoms, the use of anti-allergy drugs after the symptoms can be significantly relieved. 2. Vascular nevus: the manifestation of capillary dilatation, the skin appeared small red spots, finger pressure after the color faded or disappeared, let go of the finger and then back to red, part of the patients can be self-consuming. 3. Viral warts: caused by human papilloma virus infection, with a certain degree of contagiousness, combined with the infection can cause warts red.