A lot of small blisters on the dorsal part of the foot, consider the following diseases: 1, contact dermatitis: is due to contact with rubber or plastic slippers, resulting in skin allergies, small blisters on the surface of edematous erythema, accompanied by a certain itching sensation. In clinical treatment, you can take oral lupatadine fumarate tablets or imipramine extended-release tablets and apply topical mometasone furoate ointment mixed with bupropion ointment. Blisters with a diameter of more than 1 cm are considered large blisters and can be treated by applying a sterile syringe to extract the blistering fluid.2. Tinea corporis: ring-shaped erythema with slightly elevated edges and tiny blisters on them can appear, which is caused by fungal infection and can be treated by applying bifenazole ointment or terbinafine hydrochloride gel to kill the fungus.