Small blisters on the side of the foot are itchy, which may be caused by eczema, tinea pedis, sweat herpes and other diseases. 1. Eczema: Eczema is mainly divided into acute eczema, subacute eczema, chronic eczema. If acute eczema or subacute eczema, the skin lesions may appear the size of millet grain pimples, papules, small blisters, accompanied by obvious itching. 2. Tinea pedis: Tinea pedis is a disease caused by fungal infection, which is somewhat infectious. Such as vesicular tinea pedis, which may lead to the appearance of small transparent blisters on the feet, it is recommended to combine with the doctor’s advice to give antifungal drugs, such as bifonazole cream, ketoconazole cream topical application of treatment. 3. Sweat blisters: According to relevant research findings, hyperhidrosis, fungal infections, environmental factors, may induce sweat blisters, resulting in the appearance of small transparent blisters on the skin, blisters caused by sweat blisters, most commonly found on the lateral edge of the fingers. Small blisters and itching on the side of the foot, it is recommended to take good care of the local area and avoid scratching to induce infection. It is also necessary to go to the hospital for examination and give appropriate medication for the cause.