I've had a sunburn through the summer & it's all patchy because of the sand and missing certain spots with sunscreen. is this dangerous?

Normal Process: As injured skin heals, the body creates inflammation which means fresh blood goes to the area and with it, many kinds of healing factors and cells. One type is called melanocytes which carry our skin pigment melanin. A healing occurs, these cells may or may not return to the area and give it the brownish or lack of coloration you see. There might be some changes as the injury matures.