There are many potential causes of a red rash with blisters, including burns, genital herpes, oral herpes, shingles, allergic eczema and contact dermatitis, according to Healthline. Blisters with a red rash can also arise from friction against the skin due to clothing or shoes. Blisters are fluid-filled protrusions of the skin that can occur in isolation or in clusters.Continue Reading
If blisters and a red rash occur on or near the genitals, they may be a sign of infection by herpes simplex virus type 2, also called genital herpes. When blisters occur on the lips, on the tongue, or on the lining of the mouth, they are often the result of infection with herpes simplex virus type 1, or oral herpes.
Allergic eczema is an itchy red rash that can include blisters, and it occurs when the skin comes in contact with an allergen that results in an immune reaction, explains Healthline. The symptoms of allergic eczema typically present one or two days after contact with an allergen, and they may not occur until the second or third exposure. Some of the common allergens that result in allergic eczema include nickel, perfumes, hair dye, latex, topical antibiotics and some clothing dyes.Learn more about Skin Conditions