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Psoriasis  

Psoriasis is a chronic skin disease which rarely involves the oral cavity. Oral manifestions of psoriasis include geographic tongue, fissured tongue, angular cheilitis, gingival and mucosal lesions and (rarely) inflammation of temperomandibular joint.
Topical agents like steroids, vitamin D₃ or retinoids are used in mild cases. However, more severe forms require systemic therapy.

Image	Caption
	Figure 1: Yellowish-white scaly plaques on the dorsum of the tongue intermingled with hyperpigmented areas in a patient with psoriasis.
	Figure 2: Skin lesions of the same patient.