Causes of circular patterns on the skin include lichen planus, urticaria, ringworm and psoriasis. 1. Malassezia: The phenomenon of round patterns on the skin occurs because Malassezia violates the cuticle of the skin, resulting in skin damage. 2. Urticaria: because the skin is stimulated by allergens to trigger an allergic reaction, at this time the phenomenon of round lumpy pimples can appear on the skin. 3. Ringworm: If the skin is infected by fungi, the invasion of these fungi into the skin will trigger the appearance of rashes, so there will also be circular patterns on the skin. 4. Psoriasis: because of the role of genetic factors, immune factors and many other factors lead to skin damage, so the skin grows round scaly red spots. Finally, the phenomenon of round patterns on the skin, please go to the hospital in time to check the cause of the disease in the doctor’s guidance, symptomatic treatment.