What condition is often associated with a herald patch followed by a secondary rash in a young adult?

Pityriasis rosea is the condition that is typically characterized by the presence of a herald patch, which is often the first lesion to appear. This patch is usually a single, larger, oval-shaped, erythematous lesion that can measure 2-10 cm in size and is often found on the trunk. Following the herald patch, a secondary rash usually develops within 1 to 2 weeks, which consists of smaller, scaly, pink or salmon-colored patches that can follow a "Christmas tree" distribution on the back.

This condition is believed to be of viral origin, although the specific virus has not been conclusively identified. It often resolves on its own within 6 to 12 weeks without treatment.

In contrast, ringworm, which is a fungal infection, typically presents with round patches of hair loss and a raised, red border but does not involve a herald patch. Psoriasis is an autoimmune condition characterized by thickened, scaly plaques commonly found on the elbows, knees, and scalp rather than the herald patch followed by a secondary rash. Cherry angiomas are benign vascular lesions that are red or purple and do not present with a herald patch or secondary rash at all.