i went to the beach and got second degree sunburns and sun poisoning and yesterday when i fell asleep i woke with what appeared to be a pimple. it was yellow and pus-filled i assume and today it seems to have healed but it's dark and scaly red. i red somewhere that a yellow sore filled with pus, scabs over, and then fills with pus again is a sign of skin cancer, but i can't say for sure, so does anyone know anything??