You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is "Annular herald patch" is found in and explain in detail?
Pityriasis roses is characterised by herald patch/ mother patch it is the first manifestation of disease in 50% of patients it is a well defined erythematous oval or round lesion 2-10 cm diameter with typical colarette of scale at the margin Most common sites - chest back,abdomen extremities. widespread rash appear after herald patch in a span of 5-15 days.