Itching on the bottom of the feet has a variety of possible causes. Walking barefoot and wearing sweaty shoes make the feet susceptible to some disorders that cause itching. Other causes, such as scabies, may also cause itching on the bottom of the feet. A dermatologist can evaluate itchy feet to determine the cause and appropriate treatment. (reference 1)
Athlete's foot
Athlete's foot, or tinea pedis, is a fungal infection of the feet that causes itching on the bottom of the feet and between the toes. It is contagious, and typically spreads in damp or wet areas where bare feet are common, such as locker rooms and showers, explains the Harvard Medical School Family Health Guide. Athlete's foot can also be spread by sharing towels and improperly cleaned pedicure instruments. It starts with fissures, or cracks, between the toes. Skin becomes itchy, red and moist-looking. Blisters form, and fissures become painfully raw. If not treated, pus that produces a foul odor can result. (Reference 3)
Scabies
Scabies is an intensely itchy skin condition caused by mites that burrow deep into the skin, according to the Mayo Clinic. In children, scabies commonly affects the soles of the feet, palms of the hands, face, neck and scalp. Adults most often experience symptoms in skin folds, such as under the breasts or armpits, between the fingers, at the belt line and on the inside of the elbows and wrists. A red rash, tiny blisters and burrow tracks are symptoms. Itching is usually severe, and typically worsens at night. (Reference 2)
Pitted Keratolysis
Pitted keratolyisis, or "toxic sock syndrome," is a bacterial infection of the soles of the feet that causes a foul odor similar to rotting fish, according to an article in the journal American Family Physician. (Reference 5) It is common in athletes. Causes include unventilated shoes, sweaty feet and hot, damp weather. Pitted keratolysis causes itching and pain on the bottom of the feet. It is characterized by white patches covered with small, superficial pits that may join together and form larger lesions, Skinsight explains. A combination of treatments, including minimizing moisture, oral and topical antibiotics, antifungal creams and prescription antiperspirants, is needed to resolve the infection. (Reference 4)
