hi i have a 4 month old son who has a welt like bump on his spine, on closer inspection i noticed that it is hairy, i have concerns due to the fact that while i was pregnant with him during an ultrasound the noticed that i had an increased risk of nueral tube defect - in particular spinal bifida was wondering if i should be concerned about this lump  it is about 4cm long and 2cm wide not raised too much??
HI. Thanks for your query. Yes, the hairy lump on the spine is a telltale sign of a neural tune defect. In your case suggestive of an underlying spina bifida. Please confirm this by X-rays. Also get confirmed his movements of the lower limb. Consult a Pediatric Surgeon or a Neurosurgeon. And if the nerve supply to the lower limbs is unaffected, you have to observe for any further development as your child grows to adulthood. In later age he may need surgical interventions if there is development of neurological deficit.