"Annular herald patch" is found in
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.
Pityriasis alba
Pityriasis rosea
Tinea capitis
Psoriasis
Fungal infections, Scabies, Pediculosis