**Core Concept:** Penile ulcers are lesions that occur on the penile skin, causing pain as a key symptom. They may have various causes, including infectious, inflammatory, or neoplastic etiologies.

**Why the Correct Answer is Right:** Penile ulcers that are painful are typically due to direct tissue invasion or irritation by pathogens or inflammatory agents. In this case, the pain is a result of the tissue damage and inflammation caused by the underlying pathology.

**Why Each Wrong Option is Incorrect:**

A. Painless penile ulcers (Option A) are less likely, as pain is generally a critical component of ulcer pathology.
B. While itching may be present in some cases, pain is more prominent in penile ulcers.
C. Penile ulcers are often painful due to the sensitivity of the glans penis and surrounding tissues.
D. Painless genital ulcers can be associated with other symptoms like discharge, swelling, or fever, but pain is a key feature of painful penile ulcers.

**Clinical Pearl:** Penile ulcers should prompt a thorough clinical evaluation, as they may indicate serious underlying conditions like sexually transmitted infections (e.g., syphilis, herpes) or autoimmune disorders (e.g., pemphigus vulgaris). Prompt diagnosis and treatment are essential to prevent complications and ensure patient well-being.

**Correct Answer:** D. Penile ulcers are painful due to the sensitivity of the glans penis and surrounding tissues. Pain is a key feature of painful penile ulcers.