Lichenified means the skin has become thickened and leathery. This often results from continuously rubbing or scratching the skin.
Chronic irritation due to conditions such as eczema can cause lichenified skin. Moisturizers and topical steroids are usually used to treat lichenified skin.
Corvette DM. Morphology of primary and secondary skin lesions. In: Fitzpatrick JE, Morelli JG, eds. Dermatology Secrets Plus. 5th ed. Philadelphia, PA: Elsevier; 2016:chap 2.
Habif TP. Principles of diagnosis and anatomy. In: Habif TP, ed. Clinical Dermatology. 6th ed. Philadelphia, PA: Elsevier; 2016:chap 1.