Psoriasis on a male African-American patient's nail. Psoriasis is a skin condition where excessive growth of skin cells can lead to itchy, scaly, thickened patches (plaques) of skin which may become infected. Psoriasis is sometimes triggered by emotional stress, some infections or drugs, although often the cause is unknown.

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Photo credit: © RICHARD USATINE MD / SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: -caucasian, abnormal, adult, african-american, background, black, body, brown, clinical, condition, dermatitis, dermatological, dermatology, disease, disorder, fingernail, healthcare, human, itchy, lesion, medical, medicine, nail, papules, patient, person, plaques, psoriasis, rash, skin, thickened, thumbnail, unhealthy