Hole in the head takes a while to develop and is normally deep holes going into the head area of the fish, the fish will stop eating and try to scratch its self against rocks e,t,c as it gets worse white like worms come out of the holes,, in the early stages of the disease the holes start of as pitting in the head area of the fish,, I have had this disease on a flower horn a while ago, it's not nice and very hard to treat,, but it's very unlikely that your fish has developed it over night, your fish looks like it has scrapped its head on a rock or other object in your tank, and with good quality water and correct diet will heal up in a matter of days,, good luck