Inflammation/infection of the proximal or lateral nail folds
Usually caused by direct or indirect minor trauma (e.g. nail-biting, manicures, hangnails, ingrown nail, dishwashing)
Trauma allows entry of bacteria
S. aureus is most common, although S. pyogenes, Pseudomonas pyocyanea, and Proteus vulgaris are also common
Trauma allows entry of bacteria
S. aureus is most common, although S. pyogenes, Pseudomonas pyocyanea, and Proteus vulgaris are also common
The perinychium includes the nail, the nailbed, and the surrounding tissue.
The<unk>  is the lateral nail folds
The hyponychium is the palmar surface skin distal to the nail.
The lunula is that white semi-moon shaped proximal portion of the nail.
The sterile matrix is deep to the nail, adheres to it and is distal to the lunule.
The germinal portion is proximal to the matrix and is responsible for nail growth.
Paronychia
Bed bugs
Black hairy tongue
Closed fist infection 
Pellagra
Digital Mixoid Cyst 
Ataxia
Hand cellulitis