Figure 27. Example of yellow Image courtesy of Used with permission. Green or Black Nails Green or black nails indicate the following (Figure 28): Topical preparations, including chlorophyll derivations, methyl green, and silver nitrate (among others); Chronic spp infection; and Pseudomonas Trauma. Figure 28. Example of black nails. Processes Around the Nail Paronychial Inflammation Paronychia is associated with separation of the seal between the proximal nail fold and the nail plate that provides entry for bacteria and leads to a localized infection of the paronychial tissues of the hands (Figure 29). Symptoms may include inflammation, swelling, and/or scaling. Example chronic paronychial inflammation. Figure 29. Periungal Telangeictasia Periungal telangeictasia is caused by dilated capillary loops and results in atrophy of the cuticle (Figure 30). It is strongly associated with collagen vascular disease, including the following: Systemic lupus erythematosus; Dermatomyositis (especially with Gotton's papules over knuckles); and Scleroderma. Figure 30. Example of periungal telangeictasia. Image courtesy of Used with permission. Mucus Cyst A mucous or myxoid cyst is a collection of degenerative collagen that can cause swelling and ridging of the nail above the cyst, forming a "gutter" (Figure 31). Figure 31. Example of a mucus cyst. Cases The following are examples of patients in whom examining the fingernails may help identify their conditions.
Figure 27. Example of yellow Image courtesy of Used with permission. Green or Black Nails Green or black nails indicate the following (Figure 28): Topical preparations, including chlorophyll derivations, methyl green, and silver nitrate (among others); Chronic Pseudomonas spp infection; and Trauma. Figure 28. Example of black nails. Processes Around the Nail Paronychial Inflammation Paronychia is associated with separation of the seal between the proximal nail fold and the nail plate that provides entry for bacteria and leads to a localized infection of the paronychial tissues of the hands (Figure 29). Symptoms may include inflammation, swelling, and/or scaling. Figure 29. Example chronic paronychial inflammation. Periungal Telangeictasia Periungal telangeictasia is caused by dilated capillary loops and results in atrophy of the cuticle (Figure 30). It is strongly associated with collagen vascular disease, including the following: Systemic lupus erythematosus; Dermatomyositis (especially with Gotton's papules over knuckles); and Scleroderma. Figure 30. Example of periungal telangeictasia. Image courtesy of Used with permission. Mucus Cyst A mucous or myxoid cyst is a collection of degenerative collagen that can cause swelling and ridging of the nail above the cyst, forming a "gutter" (Figure 31). Figure 31. Example of a mucus cyst. Cases The following are examples of patients in whom examining the fingernails may help identify their conditions.