My son has had several lumps appear on his head. We just had an ultrasound and e-rays done yesterday and they have told us they are something like hives under the skin and we are going to see an allergist next week. Do you have any information on something like this you can give me?
Hi. Thanks for your query and an elucidated history. Head is a rare site to develop hives, yet still know in a few patients. This can be a seborrhea dermatitis / can be multiple furunculosis/. If the response to antihistamine and oral steroid is Chat Doctor.  So try this too.