It should be fine, it's not unusual for their stomach or tail to have slightly damaged or discolored scales. Be sure that his flooring is always clean and everything should be fine.
I see my lizard is being given Allopurinol 100ml tablet 10mg/ml (0.4) and tramadol 0.2ml every other day to help with gout. I have tramadol at home can I water it down and give it to her and if so do anyone know how much to water down ?