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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.
Morton's neuroma is a benign neuroma of an intermetatarsal plantar nerve, most commonly of the second and third intermetatarsal spaces (between the second/third and third/fourth metatarsal heads; the first is of the big toe), which results in the entrapment of the affected nerve.
Acral nevi may occur in all ethnic groups, but are more common in dark-skinned people. The acral nevus is a benign skin lesion that can occur at any age, but is generally noticed between 10 and 30 years of age. Both children and adults may be observed with this skin lesion.
Punctate porokeratosis is a skin condition associated with either classic porokeratosis or linear porokeratosis types of porokeratosis, and is characterized by multiple, minute, and discrete punctate, hyperkeratotic, seed-like skin lesions surrounded by a thin, raised margin on the palms and soles. [1]: 535 [2]: 1668
Madura foot. The initial lesion is a small swelling under the skin following minor trauma which breaches the skin. [11] [12] It appears as a painless wet nodule, which may be present for years before ulceration, swelling and weeping from sinuses, followed by bone deformity.
Knuckle pads are benign subcutaneous fibrotic nodules that are seen in the finger joints and/or the extensor area of the foot. [6] [7] [8] From a clinical perspective, these are well-defined, non-compressible, freely moveable lesions that resemble warts and primarily affect the dorsal portion of the proximal interphalangeal (PIP) and, less frequently, the metacarpophalangeal (MCP) joints.
The dorsal surface of the toes, the heels, and the fingertips are other occasionally afflicted locations. The spared web gaps between the toes is a defining trait of juvenile plantar dermatosis. The symptoms of a lesion are bright, red, dry spots. Scaling and fissuring may be visible in chronic situations. [4]
Friction ridges are disrupted by plantar warts; if the lesion is not a plantar wart, the striations continue across the top layer of the skin. Plantar warts tend to be painful on application of pressure from either side of the lesion rather than direct pressure, unlike corns (which tend to be painful on direct pressure, instead). [citation needed]