Sun exposure 2-3 weeks after rhinoplasty and septoplasty, could I have caused damage already?

Sun exposure is usually not a significant concern after rhinoplasty.  If an incision was made on the external skin, then this area should be protected from the sun whenever possible to avoid hyperpigmentation of the scar, but even a rhinoplasty incision across the columella will receive minimal exposure while walking short distances. Sun exposure to the skin will not affect the structure of the nose or any internal healing. 

Dear R. Perez1123,

 

It is usually recommended to avoid sun exposure to a healing wound for the first three months.  In light of your history, it does not sound like that was a significant amount of exposure.  More importantly, a severe sunburn on tissue that has been raised up and sewn down again (a flap) could actually be seriously damaged, so use precautions.

The incision would be the most sensitive area to sun exposure and it likely hasn't been affected. Sun exposure wouldn't affect the deep structures so I wouldn't worry too much. 

Sun exposure is not recommended for healing surgical incisions. A rhinoplasty incision is not in a sun exposed area and so I doubt it has received much sun during your short walks. Sun exposure will not cause any structural damage to the nose after rhinoplasty.