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Repeatedly thrusting the toes against a shoe's toe box can cause a subungual hematoma called jogger's toe, [8] runner's toe, or black toenail. In a marathon, several percent of runners may be affected. [4] Wearing footwear which fits helps prevent runner's toe. [4]
Tungiasis causes skin inflammation, severe pain, itching, and a lesion at the site of infection that is characterized by a black dot at the center of a swollen red lesion, surrounded by what looks like a white halo. Desquamation of the skin is always seen, especially after the flea expands during hypertrophy.
Athlete's foot is a form of dermatophytosis (fungal infection of the skin), caused by dermatophytes, funguses (most of which are mold) which inhabit dead layers of skin and digest keratin. [2] Dermatophytes are anthropophilic, meaning these parasitic funguses prefer human hosts.
Pitted keratolysis (also known as keratolysis plantare sulcatum, [1] keratoma plantare sulcatum, [1] and ringed keratolysis [1]) is a bacterial skin infection of the foot. [2] The infection is characterized by craterlike pits on the sole of the feet and toes, particularly weight-bearing areas. The infection is caused by Kytococcus sedentarius.
The most common cause of foot pain is wearing ill fitting shoes. Women often wear tight shoes that are narrow and constrictive, and thus are most prone to foot problems. Tight shoes often cause overcrowding of toes and result in a variety of structural defects. The next most common cause of foot disease is overuse or traumatic injuries. [3]
Infection on the skin of the feet may cause athlete's foot and in the groin, jock itch. Involvement of the nails is termed onychomycosis . Animals including dogs and cats can also be affected by ringworm, and the disease can be transmitted between animals and humans, making it a zoonotic disease .
A plantar wart is a small lesion that appears on the surface of the skin and typically resembles a cauliflower, with tiny black petechiae (tiny hemorrhages under the skin) in the center. Pinpoint bleeding may occur when these are scratched. Plantar warts occur on the soles of feet and toes. They may be painful when standing or walking ...
Gangrene toes in a diabetic. Gangrene is a type of tissue death caused by a lack of blood supply. [4] Symptoms may include a change in skin color to red or black, numbness, swelling, pain, skin breakdown, and coolness. [1]