Hello and welcome to
Ask A Doctor. I have read your query and here is my advice.
He may have nasal allergies. Nose bleeds can be caused by
allergy. Other signs of allergy include a personal or family history of
hay fever,
asthma, and
eczema.
Does your son also have cough, a fast
respiratory rate, or his neck muscles pulling when taking a breath? These can be indications that he is working hard to breathe and are seen in respiratory infections below the nose, for example: croup ,
pneumonia.
It would be helpful to know whether the spots on his bottom are raised, flat, circular, irregularly shaped, or itchy.
Keeping your son well hydrated will make his nasal secretions thin and watery and easier for him to blow out. Putting a small amount of Vaseline inside the front part of his nostrils may ease the irritation.
Oral medicines that can be taken at his age are: Loratadine(a non-sedating antihistamine for allergy) or pseudoephedrine(a decongestant).
Hope I have answered your query. If you have any further questions, I will be happy to help.
Arnold Zedd, MD, FAAP