Are you sure it is Cellulitis, ot could it be a Phlebitis?
To be able to answer why this happens repeatedly, then I would have to know a lot more about your son…and it’s not really appropriate on this type of forum (being public etc). However, what I would advise is that you ask your family doctor (GP) to do some investigations for Diabetes (amongst other things). People with undiagnosed Type II Diabetes often present with recurring infections, so it’s worth having this checked. If he has eczema or some other condition on his leg, then this would be a portal for entry for infection, causing the cellulitis, so if this was the mechanism, then obviously a better control of his eczema would be the solution. You definitely need to have it followed up, though…..5 times in 2 years in the same leg suggests some sort of underlying problem, so get him to go and see his GP and ask for a referral.
