Hi just looking for some advice or if anyone has seen this before. My 4 month old nearly 5 month old son has a mark next to his right eye that has been developing over a couple of week. It started out really faint and it’s now quite dark and you can’t feel a tiny little lump underneath it, doctor has told me that it’s a vein and I’m not to worry. Should I take him back get a second opinion? Image attached with dates of it progressing.