Yes, please go to a dermatologist. I had a similar problem with my youngest daughter when she was about a month old, her regular Dr. thought it was cradle cap and advised that I put a little baby oil on it - which made it worse. It was a form of ringworms. The dermatologist prescribed a shampoo, medicine and advised against putting any oil on her hair - oil helps it to spread faster and the hair falls out. I had to shampoo her hair every and keep everything clean that I used for her. Don't use what you use for him and don't use what he uses for you. I had to have separate everything for my older daughter. I hope everything works out and this helps.