New horsfield tortoise owner needs help

Hello my Horsefield Tortoise has a grey scaly patch on his head and this morning was i think sick-a white watery substance in his box also wet patch (could that be urine?)I am new to this my neighbour moved abroad and left him to me.I have an outdoor pen with shelter which she loves but have been bringing her in on rainy days and chilly nights. I place her in a tortoise box lined with news paper, she didnt seem to like straw or shredded paper and would turf it up one end and sleep down the other. I am feeding her with lettuce,cucumber,apple,pansies rose petals, and she eats every day and has today.I am also concerned about hibernation apparently she never has yet, she is 6 years old.I hope someone can help me,she is a worry, thankyou.