There are many reasons why you might have painful bumps on left side of scalp. These could be bug bites.
no
plagues of red skin that may be itchy and painful, discoloration and pitting of the nails and toenails, scales or crust on the scalp
The scalp could be red from rosacea or an allergy to shampoo.
Your scalp may sometimes get very dry,when this occurs it becomes itchy and with a scratch it may feel good but you may be cutting your scalp with out any pain,thus causing your scalp to have scaps...
I am getting a lot of them now and they make me very dizzy.
Your fingernails feel painful and red because your skin is attached to your nails.
"Yes, it is because you have to have small incisions done on your scalp, and pieces of hair sewn into them. It seems like it would be very painful once you woke up from surgery."
You might have an infection
A scalp injury is going to bleed like a river, only red. The scalp has lots of blood being pumped there (helps keep the hair alive), so when a person cuts the scalp he/she does 2 things: Go to the hospital immediately then throw the shirt away.
It is not likely.
Go to the hospital!