<unk>  is generalized exfoliative dermatitis, which involves 90% or more of the patient's skin. The most common cause of<unk>  is exacerbation of an underlying skin disease, such as psoriasis, contact dermatitis, seborrheic dermatitis, lichen planus, pityriasis rubra pilaris or a drug reaction, such as the use of topical steroids. Primary<unk>  is less frequent and is usually seen in cases of cutaneous T-cell lymphoma, in particular in Sézary's disease. The most common causes of exfoliative dermatitis are best remembered by the mnemonic device ID-SCALP. The causes and their frequencies are as follows: * Idiopathic - 30% * Drug allergy - 28% * Seborrheic dermatitis - 2% * Contact dermatitis - 3% * Atopic dermatitis - 10% * Lymphoma and leukemia - 14% * Psoriasis - 8%
Erythroderma
Pachyderma
Pathergy
Hypertrichosis cubiti
Exudative hyponychial dermatitis
Erythrasma
Road rash
Onychogryphosis