BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Psoriasis. Light micrograph of a section through skin affected by psoriasis, a chronic skin disease causing inflammation and scaly lesions. The surface of the skin (stratum corneum) is at top. There is a parakeratotic layer (top) showing abnormal keratinisation and microabcesses immediately below the cornified layer. Beneath this, the stratum spinosum layer of the epidermis is greatly thickened (acanthosis). This is a major feature of psoriasis.
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