Any surgical procedure may interfere with the bodies ability to naturally protect itself from actinic radiation (sun exposure). There are many theories for this and include difficulties with the bodies response and monitored, initiated and controlled via the nervous system. As a result, it may be very easy to burn. This has implications for scarring as well as long term development of skin cancer. Areas of prolonged inflammation may also become hyperpigmented. If and when you return to sun exposure begin slowly and with extensive sunscreen and protection with a high SPF providing broad spectrum coverage. Consider protective clothing. In summary, take "babysteps" upon returning to the sun.