**Core Concept**
Dyskeratosis refers to the premature differentiation of keratinocytes leading to the formation of abnormal cells with hyperchromatic nuclei and dense, eosinophilic cytoplasm. This process is a hallmark of certain skin disorders.

**Why the Correct Answer is Right**
The correct answer is related to the premature keratinization of cells, which is a key feature of dyskeratosis. This occurs due to the dysfunction of the cytoskeleton and the premature expression of keratin proteins. Dyskeratosis is often seen in conditions such as Darier's disease, where mutations in the ATP2A2 gene lead to abnormal keratinization and the formation of dyskeratotic cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as dyskeratosis is not a characteristic feature of psoriasis, which is characterized by parakeratosis and the retention of nuclei in the stratum corneum.
**Option B:** This option is incorrect as lichen planus is characterized by basal cell degeneration and a band-like inflammatory infiltrate, not dyskeratosis.
**Option C:** This option is incorrect as epidermolysis bullosa is characterized by blister formation due to mechanical trauma, not dyskeratosis.

**Clinical Pearl / High-Yield Fact**
Dyskeratosis is often associated with mutations in genes involved in keratinization and cytoskeleton function, making it a key feature of certain genetic skin disorders.

**Correct Answer: D. Darier's disease**