What are these red dots on my head and are they causing my crippling hair loss?

[AlexMatern]

My hair has been falling out rapidly for the past year, I've had dandruff my whole life and nothing has cured it. I'm a 22 year old male and have no family history of male pattern baldness, in fact the men in my family all have extremely thick black hair, including my grandfathers. but i found these red sores on my scalp, what do you think it is? Seborrhoeic  Dermatitis ? Keep in mind hair loss is only at top of scalp around red spots but they are all over, some new some faded, help please, I can't go bald at 22. The sores are itchy too, but they look like very tiny red dots.

[purple1234567]

There is a large variety of things that can cause this, your best bet is to get to a doctor and let them know about the issue so they can pinpoint the cause and start addressing it.