Final answer:
The 12-year-old boy with red eyes, itching, and tearing likely has allergic conjunctivitis, as indicated by his history of asthma and presentation without purulent discharge. Cobblestone mucosa is the expected finding when examining the inner eyelid in this case.
Step-by-step explanation:
The case described suggests the 12-year-old boy with red eyes, itching, and tearing bilaterally, along with a history of asthma, is suffering from a form of conjunctivitis. Given his symptoms of bilateral redness, itching, and tearing without mention of a thick, purulent discharge or significant visual changes, it's likely that the boy has allergic conjunctivitis rather than bacterial or viral conjunctivitis, which are often associated with mucopurulent or watery discharges respectively. Allergic conjunctivitis is common in individuals with other atopic conditions, such as asthma. As such, when examining the inner eyelid, we expect to see "cobblestone mucosa", which is characteristic of allergic conjunctivitis due to the formation of papillae.