The truth? A lie? Play dumb? You deciede to go with distraction so you don't have to answer the question at all.
Appearing curious, you reached out and ran your hand over the scales on her hip. Your girlfriend visibly trembled in response to your touch.
"What do you think?" you asked. "Do you think something is wrong with you?"
"I think...you should do that again..."
You complied, brushing your fingers even more slowly this time. As she trembled again, she closed her eyes to focus on the sensations and let the towel fall away to the floor. You looked at her beautiful naked body as she stood there enraptured by your touch. She brought her body closer to yours and leaned down you (sitting on the edge of the bed) and kissed you.
"I think you need a shower" she said.
She took you by the hand and led you into the bathroom. You needed no encouragement.