This condition can cause coin-shaped red patches that are dry, itchy, and inflamed. Unlike fungal rashes, these usually lack a sharply defined border.

Psoriasis

Certain forms of psoriasis can create round, red plaques with silvery scaling. These patches are often chronic and may appear on multiple parts of the body.

Allergic or contact reactions

Exposure to irritants, soaps, detergents, or fabrics can sometimes cause round patches, especially in areas with friction or sweat.

The Role of Heat, Moisture, and Friction

Skin specialists note that environmental factors play a major role in many rashes. Hot weather, tight clothing, prolonged sitting, and sweating can weaken the skin’s barrier. This makes it easier for fungi, bacteria, or inflammation to take hold.

That’s why circular rashes often appear in areas that stay covered or damp for long periods.

When Circular Patches May Need Medical Attention

While many rashes are mild, doctors recommend seeing a healthcare provider if:

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