parakeratosis - Health Topics
The woman had axillary granular parakeratosis (GP), a benign condition. First described in 1991, this disease presents with erythematous hyperpigmented and hyperkeratotic papules and plaques in ... Parakeratosis pustulosa (PP) is a cause of distal nail inflammation and nail dystrophy that affects a single digit.
Understanding the Context
It is nonpruritic and minimally painful. This distal digital dactylitis is ... Nuclear degradation is a key stage in keratinocyte terminal differentiation and the formation of the cornified envelope that comprises the majority of epidermal barrier function. Parakeratosis, the ...
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In parakeratosis, these surface cells retain their nuclei, which is not normally seen in mature keratin. This change usually means that the tissue is responding to irritation, inflammation, or injury. Parakeratosis is often seen in areas where the tissue is healing, regenerating, or under stress. Parakeratosis is a term used in pathology to describe an alteration in the skin’s outermost layer, the epidermis, concerning the process of keratinization. It is not a disease in itself but rather a microscopic finding that signals an underlying issue with how skin cells are maturing.
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Parakeratosis is marked by the retention of nuclei within the stratum corneum, disrupting normal keratinocyte maturation. In healthy epidermis, keratinocytes lose their nuclei as they migrate to the surface, forming a protective barrier. Granular parakeratosis is an uncommon red and scaly skin condition that mainly affects body folds, most often the armpits. It has a characteristic appearance under the microscope. Parakeratosis is defined as hyperkeratosis characterized by incomplete keratinization, where nuclei are retained in the cells of the stratum corneum. It is commonly associated with conditions like psoriasis and other inflammatory disorders.
Parakeratosis results from abnormal keratinocyte maturation and is defined by the persistence of nucleated cells into the stratum corneum. The presence of parakeratosis appears clinically as scale and is encountered in a wide variety of processes; scale without nucleated cells is termed orthokeratosis. Parakeratosis is associated with the thinning or loss of the granular layer and is usually seen in diseases of increased cell turnover, whether inflammatory or neoplastic. Parakeratosis is seen in the plaques of psoriasis and in dandruff.