Hello -

It is difficult to tell from the photos, but this may be Pear Scab:
http://extension.psu.edu/plants/gardening/fphg/pome/diseases/pear-scab

The lesions look silmiar to apple scab (although Pear Scab is somewhat different, there are details below):
http://ohioline.osu.edu/hyg-fact/3000/pdf/HYG_3003_08.pdf 
Here is a link to other pear diseases:
http://extension.psu.edu/plants/tree-fruit/fruit-diseases/pear 

Is the inside of the pear hard? There is a virus that causes stony pit (if you are not familiar with that disease).

I'm not familiar with your common diseases, so at this point I cannot give a confirmation. The above links should get you in the right direction, though.

Thanks for your question!