Skin lesions can be angular protrusions

The keratoid process of skin lesions is one of the main symptoms of actinic keratosis. The process of keratin formation in the stratum corneum is called keratinization. It is the process of converting cellular proteins into keratin with completely different physical and chemical properties. Keratinization involves fibrillary changes in the cytoplasm, and the breakdown and disappearance of the cytoplasm and nuclei.

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