Discoid eczema is also called nummular eczema. It occurs most commonly in adults and appears as a few coin-shaped areas of red skin on the trunk or lower legs. It may look similar to ringworm. These areas become itchy and can weep. Treatment with emollients or stronger treatment may be required. It can be considered as an adult form of atopic eczema. It can be complicated by a bacterial infection which causes weeping and crusting.