Itchy blisters on the side of the foot may be caused by tinea pedis, contact dermatitis, eczema and other reasons. 1. Tinea pedis: is due to fungal infection caused by superficial skin ringworm disease of the foot, in which the blister type tinea pedis, will cause small blisters on the side of the foot is very itchy symptoms. 2. contact dermatitis: local skin contact with external sensitizers, causing an allergic reaction, may also lead to small blisters on the side of the foot is very itchy. 3 eczema: internal and external stimulation of a variety of factors caused by the inflammatory reaction, resulting in eczema, can cause blisters, rashes, itching, may also lead to small blisters on the side of the foot is very itchy. Small blisters on the side of the foot is very itchy, there may be other reasons, need to go to the hospital in time to check, follow the doctor’s instructions for treatment.