Hyperkeratosis
Thickening of the stratum corneum, often associated with a qualitative abnormality of the keratin.
Parakeratosis
Modes of keratinization characterized by the retention of the nuclei in the stratum corneum. On mucous membranes, parakeratosis is normal.
Hypergranulosis
Hyperplasia of the stratum granulosum, often due to intense rubbing.
Acanthosis
Diffuse epidermal hyperplasia.
Papillomatosis
Surface elevation caused by hyperplasia and enlargement of contiguous dermal papillae.
Dyskeratosis
Abnormal keratinization occurring prematurely within individual cells or groups of cells below the stratum granulosum.
Acantholysis
Loss of intercellular connections resulting in loss of cohesion between keratinocytes.