The main clinical manifestation of allergic dense blisters with a Band-Aid is the appearance of well-defined erythema or even swelling in the area where the patch is applied, with dense small blisters on top, often with intense itching. This condition is diagnosed as contact dermatitis, which may be an allergy or an irritant reaction. Treatment: 1, to remove the band-aids, because re-use will also aggravate the lesions. 2, can be symptomatic treatment, such as the topical application of glyburide lotion, with Hassinaide solution topical application. If you are an adult or heavier, you can also take oral prednisone tablets. Also symptomatic topical creams, such as Denide cream, compound flumethasone ointment, etc. Do not scratch and try not to break the blisters to avoid re-infection.