The teen was found injured in Morley Road just before 2pm, police say.
He was taken to hospital and his injuries are not life-threatening.
A spokesperson from the Met said: “At this early stage, it is believed that the victim may have been attacked [in] Movers Lane.
“There have been no arrests and enquiries continue.
“Anyone with information is asked to call police via 101 quoting reference Cad 3565/27Oct.”
Photos from the scene show a police cordon in Morley Road and also outside the Royal Mail sorting office in Movers Lane.
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