Does he face difficult in urinating
The reason behind blood in urine could be because of urinary tract infection or can be because of any obstruction in urinary system
So get him checked once and then start the medication
It can be parasitic or bacterial infection
To confirm it as parasitic infection skin scrapping has to be taken and checked
So try applying kiskin lotion on the area it may reduce
If it doesn't reduce so better to get skin scrapping done