I am a fan of no medication unless you know precisely what the problem is and the medication used is the correct one.
Excellent water quality is often all that is needed for the fish to fight the problem itself.
Test all is well with the water quality. This doesn't mean that all may not have been well with it a few days ago, resulting in the pink spot if ammonia got a bit high and burnt the gill. Usually it would be a general reddening though, not a specific small spot.
Look closely for gill flukes, worms, in the gills.
One small spot I would first assume to be damage from hitting something, or another fish maybe ramming it. If this is the case you will need to keep an eye out for secondary fungal infections. These too I find usually clear themselves with good water quality and the fungus often later falls off revealing a clean and healed wound underneath.