How does ringworm look on rats? - briefly
Ringworm on rats manifests as circular, hair‑free lesions that are reddish‑brown or grayish and often covered with dry, crusty scales. The patches may have slightly raised, scaly margins that can expand if untreated.
How does ringworm look on rats? - in detail
Ringworm in rats, caused by dermatophyte fungi, presents as distinct skin lesions that can be identified through visual inspection and tactile assessment.
Typical lesions appear as circular or irregular patches of alopecia where hair is missing. The affected area often shows a raised, scaly margin that is slightly erythematous compared to surrounding skin. Within the central zone, the skin may be smoother and lighter in color, sometimes exhibiting a pinkish or grayish hue.
Lesions commonly occur on the head, ears, neck, and forelimbs, but may spread to the trunk and tail if the infection advances. In early stages, the patches are small—approximately 2–5 mm in diameter—and may be barely noticeable. As the infection progresses, lesions enlarge, coalesce, and can reach several centimeters across.
Surface texture varies: the periphery is usually rough and flaky, while the center may develop a fine crust or dry crusty layer. When gently scratched, the scales detach easily, revealing moist, raw tissue underneath. In severe cases, secondary bacterial infection can cause exudate, ulceration, or increased inflammation.
Key visual indicators include:
- Distinct circular or oval zones of hair loss
- Raised, scaly borders with a slightly reddened edge
- Central area of lighter coloration, sometimes pink or gray
- Preference for facial, ear, and forelimb regions, with possible spread to body
- Progressive enlargement and merging of individual patches
Palpation often reveals a firm, slightly raised edge and a softer, moist center. The combination of alopecia, scaling, and color change provides a reliable basis for recognizing dermatophytosis in laboratory or pet rats, facilitating prompt diagnosis and treatment.