• Here are a few options
• common in South American Spanish
• ranging slightly in formality and directness: 1. **Un par de marcas de presión casi imperceptibles en la parte superior de la espalda.** * (A pair of almost imperceptible pressure marks on the upper part of the back.) 2. **Dos o tres marcas de planchado apenas visibles en la zona superior trasera.** * (Two or three barely visible ironing marks in the upper rear zone.) 3. **Pequeñas marcas de presión
• casi invisibles
• en la espalda superior.** * (Small pressure marks
• almost invisible
• on the upper back.) The first option is generally a very good and precise translation. "Marcas de presión" or "marcas de planchado" are both suitable for "press marks" in this context. "Casi imperceptibles" or "apenas visibles" both work well for "barely noticeable.

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