• Here are a few options
• all commonly understood in South American Spanish
• with slight variations in nuance: 1. **Algunas manchas ligeras en el centro de la espalda.** * (Some light/faint stains in the center of the back.) - This is probably the most direct and common. 2. **Unas pocas marcas tenues en la parte trasera central.** * (A few faint/subtle marks on the central rear part.) - "Tenues" is a good word for "faint." 3. **Manchas poco visibles en la mitad de la espalda.** * (Hardly visible stains in the middle of the back.) - Emphasizes that they are not very noticeable. I'd lean towards **"Algunas manchas ligeras en el centro de la espalda."** as the most natural and widely understood for a defect description.

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