Anonychia
Encyclopedia
Anonychia is the absence of nails, a rare anomaly, which may be the result of a congenital ectodermal defect, ichthyosis
, severe infection, severe allergic contact dermatitis
, self-inflicted trauma, Raynaud phenomenon, lichen planus
, epidermolysis bullosa
, or severe exfoliative diseases.
Ichthyosis
Ichthyosis is a heterogeneous family of at least 28, generalized, mostly genetic skin disorders. All types of ichthyosis have dry, thickened, scaly or flaky skin...
, severe infection, severe allergic contact dermatitis
Allergic contact dermatitis
Allergic contact dermatitis is a form of contact dermatitis that is the manifestation of an allergic response caused by contact with a substance....
, self-inflicted trauma, Raynaud phenomenon, lichen planus
Lichen planus
Lichen planus is a chronic mucocutaneous disease that affects the skin, tongue, and oral mucosa. The disease presents itself in the form of papules, lesions, or rashes. Lichen planus does not involve lichens, the fungus/algae symbionts that often grow on tree trunks; the name refers to the dry and...
, epidermolysis bullosa
Epidermolysis bullosa
Epidermolysis bullosa is an inherited connective tissue disease causing blisters in the skin and mucosal membranes, with an incidence of 1/50,000. Its severity ranges from mild to lethal. It is caused by a mutation in the keratin or collagen gene....
, or severe exfoliative diseases.