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Hair casts, also known as pseudonits, represent remnants of the inner root sheath, and often occur in great numbers and may mimic nits in the scalp. [1] ...
In the embryo, the epidermis, hair, and glands form from the ectoderm, which is chemically influenced by the underlying mesoderm that forms the dermis and subcutaneous tissues. [ 5 ] [ 6 ] [ 7 ] The epidermis is the most superficial layer of skin, a squamous epithelium with several strata : the stratum corneum , stratum lucidum , stratum ...
Tufted folliculitis presents with doll's hair-like bundling of follicular units, and is seen in a wide range of scarring conditions including chronic staphylococcal infection, chronic lupus erythematosus, lichen planopilaris, Graham-Little syndrome, folliculitis decalvans, acne keloidalis nuchae, immunobullous disorders, and dissecting cellulitis.
This category reflects the organization of International Statistical Classification of Diseases and Related Health Problems, 10th Revision. Generally, diseases outlined within the ICD-10 codes L60-L75 within Chapter XII: Diseases of the skin and subcutaneous tissue should be included in this category.
Disseminate and recurrent infundibulofolliculitis, also called disseminate and recurrent infundibular folliculitis or Hitch and Lund disease, is a rare follicular skin condition that presents with irregularly shaped papules pierced by hair, is mildly itchy at times, and is chronic with recurrent exacerbations.
Pili multigemini, also known as "compound hairs," [2] is a malformation characterized by the presence of bifurcated or multiple divided hair matrices and papillae, giving rise to the formation of multiple hair shafts within the individual follicles. [3] [4]
Pili bifurcati is defined by uneven bifurcation of the hair shaft. [3] Every bifurcation forms two distinct parallel branches that eventually unite to form a single shaft. Each branch of the subsequent bifurcations is entirely encased in its own cuticle.
The pathogenesis of pseudopelade of Brocq is still not well understood. A number of potential contributing variables include senescence of the follicular stem cell reserve, acquired autoimmunity, and Borrelia infection. [3]