A red circle on skin that is not itchy can have several causes, ranging from mild infections to inflammatory conditions. Common possibilities include fungal infections like ringworm or early Lyme disease, especially if the spot slowly expands over a few days.
Ringworm often appears as a round or ring-shaped patch with a slightly raised, scaly border and clearer skin in the center. Lyme disease may start as a circular red rash that gradually gets larger and can look like a target. In some cases, other conditions like granuloma annulare or certain forms of eczema can also create round patches, though eczema is usually itchy.
Pay attention to whether the spot is growing, changing color, becoming painful, or if you develop fever, fatigue, or joint aches. A recent tick bite or contact with someone who has a fungal infection can also offer helpful clues.
Avoid self-treating with strong steroid creams without a diagnosis, as this can worsen some infections. If the lesion continues to expand, lasts more than one to two weeks, or you have other symptoms, schedule an appointment with a primary care provider or dermatologist for proper evaluation.