Porcupine Puffer with white Patches

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My porcupine puffer aka Marshmellow developed these white patches on him yesterday. He was fine during the day and acted his normal joyful self, then towards the evening he was laying behind the rocks and just chilling which is not normal for him. This morning he was excited came up for food and acted like himself this is when I noticed that he had white like patches on the top of his head behind his big beautiful blue eyes. Please any help and advice would me the world to us! I am new to this forum and this is my first post please help me❤️
Hello there is seriously no one out there who can help me ? I guess I will have to try a more involved active forum! Really was hoping to find some advice.