The air conditioning receiver pipe is leaking.
Most leaks in the AC system are seal or o-ring related. O-rings are used where two parts meet, and seals are used in the compressor. If an aluminum part (e.g., a line, the receiver dryer, condenser or evaporator) leaks, the part will need replaced. If you are not comfortable making the repair yourself, please leave it to a professional familiar with AC work; there are many things to check and special tools required to ensure the AC works as it was designed. I recommend having a certified technician, such as one from YourMechanic, come out to your Honda's location to inspect your car's AC system, and suggest the best path to repair.
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