Final answer:
The appropriate treatment for the injured wrestler is to refer to an otolaryngologist for incision and drainage (I&D) and pressure dressing, rather than antibiotics or simple dressings.
Step-by-step explanation:
The most appropriate treatment for a 16-year-old high school wrestler presenting with a fluctuant, mildly tender edematous lesion of the anterior-superior outer portion of the right pinna after an injury is to refer to an otolaryngologist for definitive treatment. This treatment would likely involve an incision and drainage (I & D) of the lesion, with a subsequent pressure dressing to ensure proper healing and to prevent additional infection or complications such as 'cauliflower ear.'
Antibiotics are generally not the first line of treatment for such injuries unless there is evidence of bacterial infection, which may manifest as erythematous and extremely tender tissue, purulence, or systemic symptoms like fever. Applying a soft bulky dressing without further action or prescribing antibiotics without indication of infection are not likely to be sufficient treatments for this type of injury.