Having issues with hex data and endianness

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I am taking hex bytes out of a buffer and trying to display them (it's a ID string in hex). I can get the data using

    USID = ProtoField.string("myproto.USID", "usidVersion")
function myproto_protocol.dissector(buffer, pinfo, tree)
    local subtree = tree:add(myproto_protocol, buffer(), "myproto Protocol Data")
    local headerSubtree = subtree:add(myproto_protocol, buffer(), "Header")
    headerSubtree:add_le(myproto_protocol.fields["USID"],         buffer:bytes(2,8):tohex())

However the displayed info is still not in little endian. I have tried using a bytes ProtoField as well with less success displaying the data. I am sure I am missing something simple but I have not messed with hex fields and Little Endian much