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Lentigo is categorized as a pigmentation disorder because it is characterized by small, flat brown spots on the skin, which are a result of increased melanin production. These spots typically occur due to sun exposure and are more common in older adults. Lentigolike lesions can appear on various parts of the body and can vary in size and number. This condition highlights the skin's ability to produce pigment, and while it is generally harmless, it's important to monitor any changes in appearance over time.

On the other hand, eczema is a chronic skin condition that causes inflammation and is primarily related to the immune system and environmental factors, not pigmentation. A mole, while it does involve pigmentation, is more accurately classified as a benign growth rather than a pigmentation disorder. Veruca, or warts, are caused by the human papillomavirus (HPV) and are also not associated with pigmentation. Understanding these distinctions is critical for identifying and managing skin conditions effectively.