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Polydactyly is a birth defect that results in extra fingers or toes. [2] The hands are more commonly involved than the feet. [2] Extra fingers may be painful, affect self-esteem, or result in clumsiness. [3] It is associated with at least 39 genetic mutations. [4] It may either present alone or with other defects. [2] Cases may run in families. [2]
The signs/symptoms of polyonychia are very easy to detect: two or more nails growing on the same finger or toe. The nails can either be separate, small nails (micronychia) or one wide, almost complete nail, the digit affected could also be wider than normal
While ingrown nails can occur in the nails of both the hands and the feet, they occur most commonly with the toenails (as opposed to fingernails). [citation needed] A common misconception is that the cause of an ingrown toenail is the nail growing into the paronychium, but it can also be caused by overgrown toe skin. [2]
Woman's toe was amputated after spot under nail diagnosed as melanoma. The toll of acral lentiginous melanoma. Woman's pinky toe amputated after spot under nail turned out to be skin cancer
The trait can be observed on either one or both feet where there is a lengthwise separation of the toenail on the corner of smallest toe. The smaller sixth toenail separates from the main toenail on the outermost side of the foot, and protrudes outwards from the corner. [1] This nail averages 2–7 mm (0.079–0.276 in) in length. [3]
Supernumerary musculature – presence of extra muscles such as additional heads of the biceps brachii, or coracobrachialis muscle variants [7] Supernumerary nipples – an additional nipple [1] Supernumerary phantom limbs – where the brain acts as though a limb were there, but it is not; Syndactyly – webbing between the fingers or toes [4]
Growing older or having poor biomechanics, which are more common in the elderly (e.g., toes that overlap and underlap; incompatibility between the foot and the shoe; or digiti flexi, which is characterized by contracted toes due to toe buckling caused by shortening of the controlling muscles), may be contributing factors. [3]
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