• Here are a few options
• ranging from more direct to slightly more descriptive
• all suitable for South American Spanish: 1. **Mancha visible en la espalda.** * (Visible stain on the back.) - *This is probably the most common and natural way to say it for a shirt defect.* 2. **Marca visible en el reverso.** * (Visible mark on the reverse.) - *Slightly more formal
• "reverso" is good for the back of an item.* 3. **Defecto apreciable en la parte trasera.** * (Noticeable defect on the back part.) - *More general
• using "defecto" for defect and "apreciable" for noticeable.* 4. **Mancha evidente en la parte posterior.** * (Evident stain on the posterior/back part.) - *Similar to above
• "evidente" is a good synonym for noticeable.* For a football shirt
• **"Mancha visible en la espalda"** is likely the most common and easily understood.

Características:

• Estampado de estilo original para el guerrero del mediocampo Barry Ferguson #6
• De manga larga