Hey there javieresquivel,
Thanks for reaching out to Apple Support Communities. I understand you’re iPhone doesn’t look as expected near the charging port, mic, and speaker. I’ll be happy to help with this.
When looking at the warranty for iPhone, it states, “This Warranty does not apply: (a) to consumable parts, such as batteries or protective coatings that are designed to diminish over time, unless failure has occurred due to a defect in materials or workmanship; (b) to cosmetic damage, including but not limited to scratches, dents and broken plastic on ports unless failure has occurred due to a defect in materials or workmanship..” You can look at the full info under “What is not covered by this warranty” here:
Apple One (1) Year Limited Warranty
That being said, you can have your iPhone inspected by an certified technician to get a final answer. To do this, reach out to Apple Support at the following link so they can look further into this with you:
Get Support
Take care.