Yes,this could likely be a birth defect, (has it been noted since birth?)Keep in mind that this could also be from certain medications.AAn example is Seizure medications, which can sometimes cause this withdrawn appearance as well. If the penis is uncircumsized, it can also have this dramitic appearance as a side effect to some medications, etc. I wish I could tell you more, but a medical workup may be able to better assist with the actual cause of this happening.
Thank you, and if I can further assist, please let me know.
Take care.
__________________
I will do my best to assist your concerns.However,if additional information is needed, or you have further questions, feel free to write again so someone can assist you.