Hello, Welcome to healthcare magic. I infer that the dryness and the bleeding of the nose is an after effect of the Decongestant drug. And when he cries, the appearance of the mucus and fluid need not be worried about as it is a normal phenomenon for the tears to pass through a passage into the nose. The dryness will take some time to recover. Avoid removing the scabs as it will only aggravate the condition. Nose picking by the child can make it worse. You can take him to your ENT physician who might suggest a local application for the nasal mucosa if necessary. And it is only a side effect of the decongestant that was used for the cold
. So do not be worried. Take care! Thank you!