Recurrent ? balanitis in 4 yo DS

[AmberBeaker]

TMI warning
4 yo healthy DS has had yellow/green discharge in his underwear on and off for 8 wks. It crusts which causes his underwear to stick to his privates which is painful. Otherwise no pain and he's weeing fine. Saw doc 3 wks ago, urine tested, some white cells. She suggested Canesten so I presume was treating it as thrush. It went away for the 5 days of Canesten prescribed. A week later its back, increased volume of discharge and now the tip is swollen and blistered.
Has anyone's son experienced recurrent thrush like this? When I look it up it seems much more common in girls. The doctor seemed a bit stumped tbh as though it was an unusual case.
I'm feeling guilty maybe it's a hygiene issue, we shower him 2x a week but we don't vigorously clean there, but I've always thought guidelines were not to retract it too much and to basically leave it be! His diet is good and immune system usually good.
Any ideas what could be causing this?
Thanks for reading

No idea but my son had this several times and we are prescribed an antibac cream called mupirocin. Gp always starts with that and says we'd move to antifungal cream ie canesten if the antibacterial doesn't work.
But it always seems to clear it within a day or 2. Maybe ask gp for that?

And also the same, I though maybe hygiene but he showers and washes without to much messing down there as I always though the same as you!

Thanks for replying. I'll ask about that. I asked the last doc if it was worth swabbing it to see if bacterial vs fungal but she said it wasn't necessary. Glad to hear it worked well, cheers