AAA
AAA has 2 meanings
Apply to affected area
Example
How often can I use the meds?
AAA q12h
AAA definition by Slang.net - The Slang Dictionary
This page explains what the slang term "AAA" means. The various definitions, examples, and related terms listed above have been manually compiled and written by the Slang.net team.
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In the medical world, AAA tells the patient they should apply the medicine to the part of their body that is infected. It may also tell the patient when to apply the medication (e.g., "once a day," "until redness subsides," etc.).
Since the acronym is not well known, you will likely see it written out as "Apply to affected area(s)." However, this is not always the case.
For example, you may have a rash on your leg, and the doctor prescribes a steroid cream to relieve the itchiness. On the medication or in the doctor's instructions, it may read, "AAA to reduce the itchiness and soothe the pain." You may also see AAA in a health-related forum where shorthand for common medical terms is prevalent.