I understand that by “lo otro” this author means what is know as “otredad”, or “otherness”, in English.

Hope to be of some help.
Buena suerte.
Manuel
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American Heritage Dictionary - Cite This Source
oth•er•ness (ŭth'ər-nĭs) Pronunciation Key
n. The quality or condition of being other or different, especially if exotic or strange: "We're going to see in Europe ... religion, royalty, picturesqueness, otherness" (Anatole Broyard).
http://dictionary.reference.com/search?q=otherness&r=66
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The strategy of self-sufficiency: ‘I don’t need’.
Then there may be the path of refusing vulnerability by trying to pretend that one does not need others or otherness; addiction to the feeling of self-sufficiency. For, Narcissus, in a
sense, there is no other and he tries to feed himself with himself. In this trajectory we can
try to puff ourselves up with images of our own specialness or strength.
(…)
But then, there is a panicked flight from this into a hoped-for freedom: the 'freedom from otherness', in which one is self-sufficient and complete.
http://www.ipjp.org/august2004/todresv4e1.pdf
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Xochimilco is an eminently Roman Catholic Area; however, an ongoing process has being incorporating new churches into the borough’s societal sphere. That means changes —not only in religious forms and practices, but also in relations with others, with an otherness that differ in how it conceives the world and its social dynamics and patterns of organization.
http://redalyc.uaemex.mx/redalyc/pdf/267/26702115.pdf
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This thesis argues that beyond the purity of the idealised creation of heritage Cornish there exist other Cornwalls. Many owe their existence to a reaction against English labelling and Englishness. Others exist as an otherness embedded in a difference in social formation which in itself lies in the difference of significant cultural markers.

The language, music, art, customs and religion were used as specific symbols of the Cornish 'otherness' or difference.
http://cornishidentity.blogspot.com/
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In particular, the weakening of the political and the cultural role of the nation-state has rendered most of the dimensions of citizenship obsolete or less significant (II.). In a brief concluding outlook I suggest that citizenship as a legal status may be a promising concept for the eventual rise of a global order which is able to cope with cultural otherness in a civilized manner (III.).

The law opened a province of social interaction in which persons could recognize each others as equals irrespective of their differences in terms of descent, religious affiliation, and social rank12. The diversity and otherness of individuals was no longer a barrier to their economic and social intercourse, nor was the geographical remoteness of the ‘others’.

This adds a further diversifying and multiplying element to the patchwork of identities which has become characteristic of more and more individuals. Thus, the increase of tolerance and understanding of “others” and “otherness” has undermined the polemical thrust of national identity.
http://ccc.uchicago.edu/docs/preuss.pdf
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I have an old dream of writing a nice and very illustrated catechism for Arab Christian kids living in very little minorities in the midst of Arabic/Islamic societies, to develop for them a possibility of identification not based on opposition to otherness and resistance to assimilation, but on discovery of positive interaction and of function in a society in which I understand, as a child, that my family tradition has a positive role for the good of the given society, blessed with Islam but also blessed by my little presence in it.
http://www.ucy.ac.cy/researchE/researchnewsE/ALFNewsletter3l...
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“Not to gather the other into one’s consciousness is, strangely enough, to be in touch with the other’s otherness to remain in contact with the inevitable elusiveness of the other who cannot be known…”
http://etd.fcla.edu/UF/UFE0007302/hwangbo_k.pdf
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<http://www.google.co.ve/search?q=“others * otherness” tolera...