My ankles are swollen and pitting can this be of my sunburn?

Maybe: Swollen ankles can be from your sunburn but can also be from early cellulitis. If it continues after a few days or you start running a fever, see a doctor.

It is possible: However, i would ask if you ever had these symptoms before the sunburn or did they occur only after the sunburn? Do you take any medications ? Suffer from high blood pressure?

Multiple causes: There are many reasons for swollen ankles. Puffy period reaction. Post-surgical swelling. Inactivity allowing gravity to pull fluid into the legs. Inflammation from physical, chemical, or sunburn trauma. If sunburn is your only new difference in your life, i could maybe be convinced. The worst case scenarios would be blood clots in the legs or congestive heart failure. Your fp may help sort it out.

What's the cause ?: Cellulitis is basically a visible inflammation (itis) of the skin and soft tissues (red, hot, swollen and tender) . It can be caused by many things including sunburn (radiation), trauma (sprained ankle) or poor vein circulation (stasis dermatitis). It need not be caused by bacteria. If you have repeated episodes of this, get to a wound care or vascular specialist, the diagnoses you have is wrong.