• Here are a few options
• all commonly understood in South American Spanish
• with slight variations in nuance: 1. **Algunas pequeñas marcas claras en la espalda.** * (Some small light marks on the back.) - *This is probably the most direct and natural for a shirt.* 2. **Unas pocas manchas diminutas y ligeras en la parte trasera.** * (A few tiny and light stains on the back part.) - *Uses "manchas" (stains) which is common for clothing marks
• and "diminutas" for tiny.* 3. **Pequeñas marcas claras al reverso.** * (Small light marks on the reverse/back.) - *More concise
• "al reverso" is also perfectly valid for the back of an item.* 4. **Presenta algunas mínimas marcas de luz en la parte posterior.** * (It presents some minimal light marks on the posterior part.) - *Slightly more formal
• often used in defect descriptions.* **Recommendation:** For a football shirt
• **"Algunas pequeñas marcas claras en la espalda."** is likely the most natural and common way to express this defect.

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