I am assuming you have created two accounts or someone else in your household has created an account also.
At 7 months old you could be dealing with the in between time when the puppy coat goes away and the adult coat starts coming in. There probably isn't follicle damage. The puppy coat was taken away prematurely by the shave and until the adult coat kicks in, which can be nearly a year old depending on where you are located, hair will be extremely slow to return. Also, if the infection or mange or whatever it was hasn't been fully taken care of that will also slow down or even roll back any progress in growing the coat that might be had.