Thank you for your photo. From your description and photo, you should seek urgent medical attention. There may be a bacterial infection over the red patch, which may be associated with an underlying acne nodule or cyst.
You may well require antibiotics and some changes to your skincare routine. As you rightly suggest, it is best to treat early to prevent any scar formation. Do see a trusted dermatologist or doctor for some advice. Hope you get well soon.
Best regards
Stephanie Ho, Dermatologist
