Added info:
hes 6 months old, he's kept in a clean enviroment, he is almost never itchy, no eye crusting, cuts, scratches, anything, he runs around a lot, is really friendly.
I give him some carrot and/or parcely every day and then once a week I give him red peper slices as a little treat, he always has hay, water and food..
I check his fur every few days, and brush him every other day(I work long shifts every other day so on the days I have off I spend a lot of time with him)